[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Benny]

I am using Debian Bullseye and I have been hunting down a resolution to
my display port issue. The monitor connected to the display port turns
off and on randomly. I replaced my dvi > display adapter as well as the
monitor and graphics card. I am using KDE not xfce, and the issue
started happening out of no where. I checked my .xsession-errors and
whenever it happens I get this output:

kscreen: Requesting missing EDID for outputs (87, 88)
kscreen: Requesting missing EDID for outputs (87, 88)
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54814, resource 
id: 31458240, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54817, resource 
id: 31458240, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54818, resource 
id: 31458240, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54819, resource 
id: 31458240, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54820, resource 
id: 31458240, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54821, resource 
id: 31458240, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54822, resource 
id: 31458240, major code: 7 (ReparentWindow), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54823, resource 
id: 31458240, major code: 6 (ChangeSaveSet), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54824, resource 
id: 31458240, major code: 2 (ChangeWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 54825, resource 
id: 31458240, major code: 10 (UnmapWindow), minor code: 0

My dmesg look like this ever time it happens :

[ 1632.206060] radeon_dp_aux_transfer_native: 32 callbacks suppressed
[ 1681.619089] radeon_dp_aux_transfer_native: 116 callbacks suppressed
[ 1691.035261] radeon_dp_aux_transfer_native: 620 callbacks suppressed
[ 1751.408510] radeon_dp_aux_transfer_native: 116 callbacks suppressed
[ 1788.349239] radeon_dp_aux_transfer_native: 116 callbacks suppressed
[ 1867.122756] radeon_dp_aux_transfer_native: 116 callbacks suppressed
[ 1884.547082] radeon_dp_aux_transfer_native: 368 callbacks suppressed
[ 2173.600344] radeon_dp_aux_transfer_native: 620 callbacks suppressed
[ 2184.684924] radeon_dp_aux_transfer_native: 368 callbacks suppressed
[ 2240.267642] radeon_dp_aux_transfer_native: 242 callbacks suppressed
[ 2247.776015] radeon_dp_aux_transfer_native: 368 callbacks suppressed
[ 2256.276441] radeon_dp_aux_transfer_native: 426 callbacks suppressed
[ 2261.280666] radeon_dp_aux_transfer_native: 410 callbacks suppressed
[ 2266.304866] radeon_dp_aux_transfer_native: 578 callbacks suppressed
[ 2271.321115] radeon_dp_aux_transfer_native: 662 callbacks suppressed
[ 2307.710745] radeon_dp_aux_transfer_native: 74 callbacks suppressed
[ 2317.267183] radeon_dp_aux_transfer_native: 242 callbacks suppressed

my syslog lookg like this:
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: XRandROutput 86 
update
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_connected: 1
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_crtc 
QObject(0x0)
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011CRTC: 0
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011MODE: 0
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011Connection: 1
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011Primary: false
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: Output 86 : 
connected = false , enabled = false
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: XRandROutput 87 
update
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_connected: 0
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_crtc 
XRandRCrtc(0x55c90985a650)
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011CRTC: 80
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011MODE: 90
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011Connection: 0
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011Primary: true
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: Output 87 : 
connected = true , enabled = true
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: XRandROutput 88 
update
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_connected: 0
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011m_crtc 
XRandRCrtc(0x55c90985ab80)
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011CRTC: 81
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: #011MODE: 90
Dec  5 02:09:37 dtop org.kde.KScreen[2339]: kscreen.xrandr: 

[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Benny]

ATI HD6850 , 3 Dell monitors

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Luis]

This anoying bug keeps happening on Ubuntu 19.04 Disco. I have two DELL
monitors connected via DisplayPort, and when I powerup my workstation
with the screens off (via BIOS alarm), the screens are black. However, I
verify that text consoles keep working. So I log in and run systemclt
restart display-manager to restart the whole display subsystem, and
keeep back the graphical logging screen.

Anyone have idea why this happens ? Reading the comments, looks that is
years old and is independent from the GPU.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[FiNeX]

Hi, the same bug is reproducible even on Archlinux with Nvidia drivers
418.43-4, Linux Kernel 4.20.13, Xorg  1.20.4, NVIDIA GeForce GTX 660 and
a couple of ACER BE270Ubmjjpprzx monitor connected using Display port
with daisy chain.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Dane Mutters]

Issue persists in 18.04.  All OS upgrades installed as of June 25, 2018.

Dell XPS 13" L321X Mini Displayport -> HDMI adapter -> HDMI cable -> LG
43lx570h television.

Interestingly, I was able to get this setup to work on a different model
of television, just a few days earlier.  I don't currently have access
to that TV, but when I get back to where it is, I'll do another test.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Xav Paice]

FWIW, seeing this using any desktop environment, and at the login
screen.  Have tried, i3, awesomewm, Gnome and Unity.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Xav Paice]

Seeing this on Bionic also, with 2 external screens and the built in
laptop display.

   product: UX303UA
   vendor: ASUSTeK COMPUTER INC.
product: HD Graphics 520
configuration: driver=i915 latency=0

I've attached my Xorg.log if that's helpful.

On first boot, or after unplugging the external displays (e.g. to walk
away), then reconnecting them, one or the other screen (or both) refuse
to power on, even if I fiddle with the power button.  Sometimes
unplug/replug helps, mostly not.  Eventually, after turning the screens
on and off via xrandr/arandr, multiple times, I can usually get them
both back on.  I see the same thing if I connect two screens via a MST
hub, or one screen there and one via the HDMI port.  It's got that race
condition feeling about it, in that I can do the same thing several
times over and one of the times it works fine, but the others not.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Xav Paice]

It really didn't like me trying to attach the log file.  Here's a
pastebin: https://paste.ubuntu.com/p/mm4cwkGv4z/

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[chrisl]

I just ran into this problem when finally moving from a VGA KVM to
StarTech Displayport dual KVM. I switch between my win10 work laptop and
my Ubuntu Mate 17.10 desktop with GeForce GTX 1060. I can start up
Ubuntu and display is as expected, then switch to the laptop and all ok
there too.

When I switch back to Ubuntu the display is highly distorted. I switch
to command line and restart, but the display will not come back
initially, I'll have to hard power the machine and start it again, then
my display returns. This only happens when using Displayport KVM. When I
tried switching back to the VGA KVM all normal again.

Distributor ID: Ubuntu
Description:Ubuntu 17.10
Release:17.10
Codename:   artful

*-display
description: VGA compatible controller
product: GP106 [GeForce GTX 1060 6GB]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:26 memory:f600-f6ff memory:e000-efff 
memory:f000-f1ff ioport:e000(size=128) memory:c-d

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Éric]

On archlinux up-to-date (linux 4.12.12), I hit the same problem on the
following hardware :

- AMD HD5850
- Benq GW2765HE (DP 1.2)

Solutions I've tried :

- Disabling/enabling DDC/CI
- Disabling/enabling DP Auto Switch (Benq-specific feature I suppose)
- Downgrading to DP 1.1 on the screen

What worked for me is to load the kernel with radeon.audio=0 as per :

https://wiki.archlinux.org/index.php/ATI#DisplayPort_stays_black_on_multimonitor_mode

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[santoshbs]

I am having the same issue in Lubuntu 17.04 using AMD Firepro W4100 GPU.
Switching off the monitor (Dell) and switching it back on results in
monitor displaying no DP signal. No key combinations or mouse movements
help. The only way I can get it back is hard restart of the computer.
Quite frustrating issue!

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Andy McCallum]

I have this problem on Ubuntu 17.04 using nvidia-381 driver on a Gigayte
GTX 1060 card.

After screen blanking from a dpms command or the screensaver power
saving, my HP Z27s (3840x2160 pixels) monitors only show black then "no
signal".

Both monitors are connected via DisplayPort.

The monitors immediately turn on when I switch to a text console.
Returning to the graphics display shows no signal.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[spike speigel]

** Tags added: xenial yakkety

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Igor]

Still happens in Ubuntu 16.04.2 with Intel graphics. Moreover, after
using of DisplayPort 1.2 monitor won't get back even after PC restart.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Jelle De Loecker]

This still happens in Ubuntu 16.10.

I have an AMD Radeon RX480, using the open-source drivers.

I'm using three 4K LG screens.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Adel Abula]

Same issue with Dell P4317Q GTX 960 with nvidia-370 drivers on Ubuntu
16.04.

One thing that I can be sure is, it is only happening when you connect
the screen with display port. It happens with or without nvidia drivers.
Looks like it is linux kernel or ubuntu desktop issues.

The screen blacks out occasionally and comes up on immediately.  I hope
below helps.

adel@Adel:~$ uname -a
Linux Adel 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 
x86_64 x86_64 GNU/Linux
adel@Adel:~$ sudo lshw -short
H/W path   Device   Class  Description
==
system Z170MX-Gaming 5 (To be filled by 
O.E.M.)
/0  busZ170MX-Gaming 5
/0/0memory 64KiB BIOS
/0/3d   memory 128KiB L1 cache
/0/3e   memory 128KiB L1 cache
/0/3f   memory 1MiB L2 cache
/0/40   memory 8MiB L3 cache
/0/41   processor  Intel(R) Core(TM) i7-6700K CPU @ 
4.00GHz
/0/42   memory 32GiB System Memory
/0/42/0 memory 8GiB DIMM Synchronous 2133 MHz 
(0.5 ns)
/0/42/1 memory 8GiB DIMM Synchronous 2133 MHz 
(0.5 ns)
/0/42/2 memory 8GiB DIMM Synchronous 2133 MHz 
(0.5 ns)
/0/42/3 memory 8GiB DIMM Synchronous 2133 MHz 
(0.5 ns)
/0/100  bridge Sky Lake Host Bridge/DRAM 
Registers
/0/100/1bridge Sky Lake PCIe Controller (x16)
/0/100/1/0  displayGM206 [GeForce GTX 960]
/0/100/1/0.1multimedia NVIDIA Corporation
/0/100/1.1  bridge Sky Lake PCIe Controller (x8)
/0/100/1.1/0   wlp2s0   networkWireless 7260
/0/100/14   busSunrise Point-H USB 3.0 xHCI 
Controller
/0/100/14/0usb2 busxHCI Host Controller
/0/100/14/0/5   busUSB5734
/0/100/14/0/5/3 busUSB3.0 Hub
/0/100/14/1usb1 busxHCI Host Controller
/0/100/14/1/5   busUSB2734
/0/100/14/1/5/2 multimedia Logitech Webcam C930e
/0/100/14/1/5/3 busUSB2.0 Hub
/0/100/14/1/5/3/2   input  USB Receiver
/0/100/14/1/5/3/3   multimedia USB Multimedia Audio Device
/0/100/14/1/5/3/4   input  MECH
/0/100/14/1/5/5 input  Hub Controller
/0/100/14.2 genericSunrise Point-H Thermal subsystem
/0/100/16   communication  Sunrise Point-H CSME HECI #1
/0/100/17   storageSunrise Point-H SATA controller 
[AHCI mode]
/0/100/1b   bridge Sunrise Point-H PCI Root Port #17
/0/100/1b.2 bridge Sunrise Point-H PCI Root Port #19
/0/100/1b.2/0  enp4s0   networkKiller E220x Gigabit Ethernet 
Controller
/0/100/1c   bridge Sunrise Point-H PCI Express Root 
Port #1
/0/100/1c/0 bridge Intel Corporation
/0/100/1c/0/0   bridge Intel Corporation
/0/100/1c/0/1   bridge Intel Corporation
/0/100/1c/0/2   bridge Intel Corporation
/0/100/1c/0/2/0 busIntel Corporation
/0/100/1c/0/2/0/0  usb4 busxHCI Host Controller
/0/100/1c/0/2/0/1  usb3 busxHCI Host Controller
/0/100/1c/0/4   bridge Intel Corporation
/0/100/1c.4 bridge Sunrise Point-H PCI Express Root 
Port #5
/0/100/1d   bridge Sunrise Point-H PCI Express Root 
Port #9
/0/100/1d.4 bridge Sunrise Point-H PCI Express Root 
Port #13
/0/100/1f   bridge Sunrise Point-H LPC Controller
/0/100/1f.2 memory Memory controller
/0/100/1f.3 multimedia Sunrise Point-H HD Audio
/0/100/1f.4 busSunrise Point-H SMBus
/0/1   scsi5storage
/0/1/0.0.0 /dev/sda disk   1TB ST1000LM014-1EJ1
/0/1/0.0.0/1   /dev/sda1volume 243MiB Linux filesystem partition
/0/1/0.0.0/2   /dev/sda2volume 931GiB Extended partition
/0/1/0.0.0/2/5 /dev/sda5volume 931GiB Linux LVM Physical Volume 
partition
/1  power  To Be Filled By O.E.M.
/2 veth743011d  networkEthernet interface
/3 

[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[eezacque]

Same issue with Dell P2314H on Ubuntu 16.04.

Every now and then when the monitor falls into power saving mode, when I
wake it up, it shows a 'entering power saving mode' and blacks out. When
I try to access the monitor menu, it says there is no signal, and so
does my connected Cintiq. Only a reboot helps.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Jonas Moody]

Same issue with Ubuntu 16.04.1.

Same issue when installing Debian 8 (Jessie) 64-bit. I was able to
install Debian by using Basic Graphics mode install, and installing
proprietary NVIDIA drivers after basic graphics install.

Ubuntu goes straight to black screen, followed by a no signal message,
monitor wake up, no signal message, repeat.

Asus PB287 monitor, NVIDIA 970 GPUs

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Thomas]

I have the same problem with Ubuntu 16.04.1. After turn of and turn on
the monitor there is no signal from Ubuntu. My motherboard is Asus Z97M
Anniversary with Intel Grafik onboard.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[xaxazak]

Also affects me on both Linux Mint XFCE 18 and Fresh install of Xubuntu
Yakkety.

This prevents me using either my main monitor or my new graphics card.
As it's been hanging around a while and can cause major problems I think it 
should be assigned a high priority.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Gary Wu]

I'm also having this issue on Xubuntu 16.04.1 LTS fresh install, Intel
graphics.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Dejan]

If you are interested why DisplayPort doesn't work, but soon should  ;-)
https://www.youtube.com/watch?v=6301tGNs9Dc

What I understood from presentation, is:
- Intel graphics card don't work with DisplayPort 1.2 and 4k monitors, because 
there is no bandwidth?
- So, I should make my NVidia card working on my laptop ... HP Zbook 15

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Dejan]

Hi,

When is this going to be fixed?
I am planning to by new monitor and new monitors only have displayport or hdmi. 
My laptop only has displayport and it will not work. BTW, I tested my laptop 
with several monitors through displayport and none is working.
Laptop: HP Zbook with Intel and NVidia graphics on Ubuntu 16.04 latest.
Using Intel graphics, since NVidia doesn't work correctly on boot (another 
bug...)

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Santiago Velasco]

This is still present in Xubuntu 16.04.1 LTS

I am using something very similar to last poster, embededd intel
graphics driver.

I have this motherboard: ASROCK Q9000
asrock.com/mb/Intel/Q1900-ITX/?cat=Specifications

00:02.0 VGA compatible controller: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics & Display (rev 0e)

I am also connected to a Sony TV, but I am using the DVI output with
HDMI to DVI cable.

Switching to the virtual terminal 1 with alt+f1 works and I can restart
lightdm from there and everything works, once I do.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Kurt von Finck]

This bug is still present in Xubuntu 16.04.1. It is not specific to
nVidia or DisplayPort hardware.

If I power off the Sony TV to which the Xubuntu machine is connected via
HDMI, when the TV is powered on there is no signal to the TV.

Restarting lightdm will return video output, but not audio.

I am using embedded Intel graphics. Output of lspci and xrandr are
below:

00:02.0 VGA compatible controller: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics & Display (rev 0e)

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm 
x 900mm
   1920x1080 60.00*+  59.9424.0023.98  
   1920x1080i60.0059.94  
   1280x1024 60.02  
   1280x720  60.0059.94  
   1024x768  60.00  
   1440x480i 59.94  
   800x600   60.32  
   720x480   60.0059.94  
   720x480i  60.0059.94  
   640x480   60.0059.94  
HDMI2 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Martin Blais]

I'm also experiencing this problem.
I had the following configuration:

MacbookPro 8,1 13" laptop (2011)
Dell UltraSharp U2715H LED monitor
Ubuntu 14.04
Mini-Displayport (computer) to Displayport (monitor) connector

I had those annoying 2-3 second unpredictable intermittent blanks,
driving me crazy.

I used to have the problem with a Dell 24in monitor 2408WFP as well (same 
computer).
I figured it was something to do with the monitor and bought the new monitor 
(since we needed a second one anyhow).

But the problem persisted with the U2715H.

I figured it might be something to do with the computer (anecdotally it seemed 
to occur more often when it heats up, though I'm not certain).
I needed to change that old computer anyhow, so I bought an Intel NUC to 
replace the laptop. 

New configuration:
Intel NUC NUC6i5SYH w/ 32GM of RAM
Dell UltraSharp U2715H LED monitor
Ubuntu 16.04
Mini-Displayport (computer) to Displayport (monitor) connector (same cable).

Lo and behold... same problem!

All that leaves is
- the cable, or
- the software.

Now I just got myself an HDMI to HDMI cable to the Intel NUC.
Just began testing. Hopefully the problem will be gone.

Happy to test again later if someone fixes the bug--contact me


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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[DaneM]

In case it's needed, here is my lspci output.

00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family 
DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series 
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family 
High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 2 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 4 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation QS67 Express Chipset Family LPC 
Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 
6 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus 
Controller (rev 05)
02:00.0 Network controller: Intel Corporation Centrino Advanced-N 6230 [Rainbow 
Peak] (rev 34)
03:00.0 USB controller: Fresco Logic FL1009 USB 3.0 Host Controller (rev 02)

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[DaneM]

I'm experiencing this issue in Ubuntu 16.04 on a Dell XPS 13 L321X.  I'm
connecting to a TV using a mini displayport to HDMI adapter.  Ubuntu
Settings > Display shows only the built-in laptop monitor.

Thanks for your work.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Giuseppe D'Angelo]

This is still open for Ubuntu 16.04, by the way (confirmed on a GTX
970).

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[dhd]

I just upgraded to Kubuntu 16.04 LTS.
Problem resolved - case closed.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[dhd]

I experienced this problem when I switched from DVI to Display-port due to 
purchase of a a new monitor "LG 34UC97" running a resolution of 3440x1440. 
- (K)Ubuntu version is 15.10
- drivers installed are "plain" out of the box, more or less beside the usual 
"apt-get upgrade".
- GPU is definetly a "nvidia geforce gtx 750 TI", however ubuntu reports it as 
a "GTX 970". My previous ubuntu (?) reported the card correctly.
- nvidia drivers are the one installed via kubuntu, namely  352.63. I tried to 
"handinstall" the latest from nvidia but that screwed up so I rolled back.

1) The problem occurs in the following cases:
a) user must be logged in. screen-log or not, does not matter.
b) display-port attached monitor is switched off (e.g. over night).
c) monitor is switched on but complains now about not receiving a display.

2) The problem does NOT occur when:
a) no user is logged in, e.g. only kdm/lightdm login screen is there.
b) on windows 10 ( I have installed parallel)

I assume the GPU switches off its "service" via display-port to the monitor 
once the monitor is switched off. 
However it does not resume "service" when the monitor comes back again.

The problem cannot be so difficult to solve as it does not happen in 2b)
and especially in 2a) mentioned before.

Are there any consolidated updates and solutions for the topic?

thanks.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[Mark O'Sullivan]

I had this both on Elementary OS and Xubuntu. I've got an AMD card and
tried using additional drivers, so I selected one of the video drivers,
in my case I picked the following option in eOS 'Using Video driver for
the AMD graphics accelerators from fglrx-updates (proprietary)'.

This solved the problem of not being able to consistently use a
secondary monitor which was using a display port. However I'm now not
able to screenshot anything as it only shows the wallpaper now.

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  [DisplayPort] monitor shows black screen and "no input signal" after
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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[reddaly]

Here is a related thread on the nvidia site.  Some monitors do not
respond to DisplayPort power management commands properly.

https://devtalk.nvidia.com/default/topic/791786/dpms-not-working-on-
gtx980-with-displayport-connection/

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[reddaly]

http://askubuntu.com/questions/546818/displayport-monitor-not-detected-
if-switched-off-and-on-again is relevant, too.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually

[reddaly]

I'm also experiencing this with an NVidia card and  a Samsung s27a850
monitor.  Can someone who is knowledgable about the software advise
about what a fix would require?

For me, the main symptoms are
1) pressing power button on monitor causes Ubuntu to drop the screen from list 
of displays, rearranging my meticulously positioned windows.
2) monitor doesn't go to sleep when 2 other monitors go to sleep.  It stays on 
indefinitely.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and no input signal after turning the monitor off and on manually

[Bugs Bunny]

I also have the problem with the blank screen after monitor power cycle.
I'm running Xubuntu 14.04 on a Dell Optiplex 7010 with a Radeon HD 7570 VGA 
card that is attached to an LG ultrawide monitor (2560x1080) via DisplayPort, 
my desktop is XFCE4.

As this problem is very annoying I googled quite a bit and found this and that 
but nothing really helped.
I also stumbled upon the fact that there must be something weird with 
xfsettingsd: at least under some circumstances this daemon was said to be 
responsible for leaving a blank screen while crashing when the monitor gets 
switched on.

So I had a look whether this is also true in my situation but
xfsettingsd was still happily running while the screen refused to come
back on.

Don't know exactly why (maybe the anger at xfsettingsd to fail somewhere
;-)) but I just killed the running instance and was completely stumped
to see the display turning on again ...

Even stranger is: I tried that several times - monitor switch off/on -
and suddenly it wouldn't lead to a blank screen any more =:-O

Only thing that could happen then was a flickering display; but I could
get rid of that by a forced dpms cycle (via xset dpms force off/on with
a sleep 1 in between).

When killed with a hangup (SIGHUP/1) xfsettingsd will normally be
restarted automatically (by XFCE session handling I guess); if it
doesn't you might recognize this by different window decorations or so,
just start it manually then.

Hopefully my experiences help someone else, and maybe I have the time
sometimes to dig into the problem ...

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and no input signal after turning the monitor off and on manually

[Joe Wein]

Same problem here - running on a Core i3-2100T with Intel HD Graphics
2000 on 14.04 LTS. After switching off the monitor connected via
DisplayPort only a reboot or a sudo service lightdm restart will get
the screen back. It does not happen with DVI.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and no input signal after turning the monitor off and on manually

[Ben]

This affects me too. I have a Radeon HD 7970/8970 OEM / R9 280X and the
display is a Samsung U28D590D. The display disconnects on entering
standby or when manually switched off. Siwtching manually to tty1 before
switching the display on again solves this sometimes but is not reliable
and not a usable solution.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and no input signal after turning the monitor off and on manually

[Christophe]

This affects me too. I have a Radeon HD 7970/8970 OEM / R9 280X and the
display is a Samsung U28D590D. Using an HDMI cable works perfectly.
Using DisplayPort makes the display be disconnected when light-locker
kicks in. I have to manually reconfigure the display until it shows me
images again. I do notice that the display receives some sort of signal
when I active my computer. But it shows no image and then goes back to
idle.

I have a seconday monitor connected via DVI and that monitor keeps
working perfectly.

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[Bug 1313539] Re: [DisplayPort] monitor shows black screen and no input signal after turning the monitor off and on manually

[Thaddaeus Tintenfisch]

** Summary changed:

- monitor shows black screen and no input signal after turning the monitor 
off and on manually
+ [DisplayPort] monitor shows black screen and no input signal after turning 
the monitor off and on manually

** This bug is no longer a duplicate of bug 1308105
   Xfce resets TV mode to NULL when power cycled

** Package changed: xfce4-settings (Ubuntu) = ubuntu

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