Public bug reported:
I just upgraded from Ubuntu 16.04 LTS to 18.04 LTS. Previously, this
was all working correctly: I have 3 displays connected to an nVidia GT
730. VGA-0 (an old 21-inch CRT) is never enabled (just haven't got
around to removing it). DVI-D-0 is the primary display, always
connected and turned on, in 1920x1080 60hz. HDMI-0 is a secondary
display (actually, linked to my AV receiver and then to my 55" HDTV),
and it is turned on when I want the big screen (1920x1080 60hz,
positioned to the left of the primary), turned off the rest of the time.
Now, whenever I turn off my secondary HDMI display, my third (VGA)
display is automatically enabled. Furthermore, when I then turn the
secondary display back on, it is set to the wrong mode (interlaced at 30
Hz instead of progressive scan at 60 Hz) and in the wrong position (to
the right of the main display, when I want it to the left). Running the
correct 'xrandr' command to reset all three displays to the correct
conditions instead results in random behavior--instead of a 3840x1080
screen, with the primary display offset to +1920x0, I usually end up
with both displays set to span the entire 3840x1080 area, offset to +0x0
(so they're mirroring each other). Sometimes the VGA display remains
turned on with a random (not actually displayable) resolution, sometimes
it does not. Trying to force the displays into the correct mode with
further 'xrandr' commands does not work; I have to reboot the machine to
get the displays back to where they belong.
This is the 'xrandr' command that SHOULD reset the displays to the
correct modes/positions (the primary DVI display is already in the
correct mode, so I don't specify that): xrandr --output VGA-0 --off
--output DVI-D-0 --primary --output HDMI-0 --size 1920x1080 --rate 60
--left-of DVI-D-0
Occasionally, it does work correctly, but most of the time, it does not
(see above).
Under 16.04 LTS, I did have an issue for a long time where the secondary
HDMI display would be set to an interlaced mode when I turned it back on
(but otherwise, everything was correct--and a simple 'xrandr -output
HDMI-0 --auto' fixed it); that problem was corrected with a kernel
upgrade a short time ago (maybe 3 months?--unfortunately, I never filed
a bug and just lived with it, so I'm not sure exactly when the problem
went away, either).
Attached is the output of 'xrandr' with everything set correctly.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-32-generic 4.15.0-32.35
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: jonathan 2183 F.... pulseaudio
/dev/snd/controlC1: jonathan 2183 F.... pulseaudio
/dev/snd/controlC0: jonathan 2183 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
Date: Sun Aug 19 15:38:09 2018
HibernationDevice: RESUME=UUID=e0d7d646-78bf-474b-916a-ad6f8523c1b5
InstallationDate: Installed on 2015-08-17 (1098 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: System manufacturer System Product Name
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-32-generic
root=UUID=2cd20c22-0c69-4ae2-b81c-11fd8501a2ec ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.15.0-32-generic N/A
linux-backports-modules-4.15.0-32-generic N/A
linux-firmware 1.173.1
RfKill:
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-08-15 (4 days ago)
dmi.bios.date: 06/14/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0307
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A88T-M LE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0307:bd06/14/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A88T-MLE:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic display multimonitor xrandr
** Attachment added: "'xrandr' output with correct modes & positions"
https://bugs.launchpad.net/bugs/1787861/+attachment/5177693/+files/xrandr.output
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1787861
Title:
Displays not detected/positioned correctly when
disconnected/reconnected
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787861/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
