This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1989169
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1989169
Title:
No video output if displayport monitor off on boot
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hi, on Kubuntu 22.04 Desktop (Minimal Install), I'm getting an issue
where, if the monitor is turned off during boot, when the monitor is
turned on later, no video signal will be found.
Steps to reproduce:
- Fresh install Kubuntu 22.04, minimal install, autologin. Install all
updates as of 9/9/2022.
- PCs we have tried: Dell Optiplex 7060, Lenovo ThinkCentre M73
- Monitor is connected via displayport.
- Verify Kubuntu has installed correctly and everything is working.
Shut down.
- Turn off monitor via its power button.
- Turn on PC. Wait for Kubuntu to boot.
- Turn on Monitor. It shows "No Signal" and goes back to sleep.
Expected behaviour: It displays the desktop as normal.
- Pressing Ctrl+Alt+F2 will wake the monitor with the command prompt.
Pressing Ctrl+Alt+F1 to switch to desktop will put the monitor back to
sleep again with No Signal.
- Connecting to the PC via a remote desktop software will only show a
black screen instead of the desktop. GUI Applications autostarted via
startup script will still be displayed, though.
- I haven't found any way to get the desktop to display, except for
restarting the PC with the monitor turned on.
I have a specific use case where sometimes the monitor is off when a
PC is booted, and it needs to function correctly when the monitor
turns on later.
Hopefully this is reproduceable on your end, and a solution or
workaround can be found. Happy to supply any further information if
needed. Thanks.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1989169/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
