After connecting via “real” DP-cable the situation is slightly
different.

The external monitor now is showing a picture when booting which was not
the case while connected via HDMI.

`xrandr` now shows connection via DP-2. When going to standby after
waking up monitor settings are changed to “single display”. When I
change it back to “join” the external monitor will wake up and show a
picture. So that’s an improvement at least although still funny. I
wonder how it would go with DP connected via usb.

I also conducted a firmware update but to no avail.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1915382

Title:
  external Monitor shows »No Signal« after dpms sleep

Status in xorg-server package in Ubuntu:
  New

Bug description:
  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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1915382/+subscriptions

-- 
Mailing list: https://launchpad.net/~desktop-packages
Post to     : desktop-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~desktop-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to