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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. So
"Why can't you make sure the monitor is always on when booting" is
unfortunately not a solution.
Hopefully this is reproduceable on your end, and a solution or workaround can
be found. Happy to supply any further information if needed. Thanks.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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No video output if displayport monitor off on boot
https://bugs.launchpad.net/bugs/1989169
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