Public bug reported:
My external Monitor connected via HDMI is behaving strange and my
educated guess is it is related to dpms.
Plugging in the monitor it will show »No Signal« although recognized by
`xrandr`. I would have to boot my machine with the monitor plugged in to
make it work. When going to standby (screen blanks after lock, then
screen goes to standby) the monitor is switched on (LED is going white)
and shortly after it will show the no-signal-message. `xrandr` claims
the monitor to be existent. Unplugging and replugging does not help.
Same happens when logging out to greeter. Strange in so far as when
booting up, the greeter is okay with the monitor.
When issuing `xset -dpms` the behaviour changes and the monitor will
enter sleep and come back as expected when locking the session.
Console (tty1-6) is available though at all times.
(I generated the bug report with dpms set off accidentally)
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
Uname: Linux 5.4.0-65-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: Regolith:GNOME-Flashback:GNOME
Date: Thu Feb 11 09:51:33 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation UHD Graphics [8086:9bc4] (rev 05) (prog-if 00 [VGA
controller])
Subsystem: Dell Device [1028:09c3]
InstallationDate: Installed on 2021-02-10 (0 days ago)
InstallationMedia: Regolith 20.04.0 1.4.1 LTS amd64 (20200511)
MachineType: Dell Inc. Precision 7550
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-65-generic
root=/dev/mapper/vgregolith-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/15/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.2
dmi.board.name: 090NVT
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.3.2:bd07/15/2020:svnDellInc.:pnPrecision7550:pvr:rvnDellInc.:rn090NVT:rvrA01:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 7550
dmi.product.sku: 09C3
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug focal ubuntu
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1915382
Title:
external Monitor shows »No Signal« after dpms sleep
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