Bug 456061 - System hang after displays are turned off and left unattended for a few minutes
Summary: System hang after displays are turned off and left unattended for a few minutes
Status: RESOLVED NOT A BUG
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (show other bugs)
Version: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2022-06-28 05:46 UTC by jsdeckerido
Modified: 2022-07-31 05:31 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
journal log (274.43 KB, text/x-log)
2022-06-28 05:46 UTC, jsdeckerido 		Details
View All Add an attachment

Note You need to log in before you can comment on or make changes to this bug.
Description jsdeckerido 2022-06-28 05:46:52 UTC 
Created attachment 150212 [details]
journal log

SUMMARY

System hang (not accepting keyboard/mouse input) after left unattended for a few minutes



STEPS TO REPRODUCE

Run KDE/Plasma on Wayland,
Do nothing and wait until displays are timed-out.
Wait for a few more minutes.


OBSERVED RESULT

System hang (not accepting keyboard/mouse input)

In journal log there's autorandr repeatedly failing. Removing autorandr just gets rid of the error message but the hang remains.
Doesn't not happen on X11, Doesn't not happen with Sway. Couldn't test with GNOME since I couldn't get GNOME to turn off my displays at all.


EXPECTED RESULT

System continues to function as normal, being able to wake up the displays with keyboard/mouse
Comment 1 Nate Graham 2022-06-28 18:37:18 UTC 
What version of Plasma/KWin are you using?
Comment 2 jsdeckerido 2022-06-29 02:16:53 UTC 
(In reply to Nate Graham from comment #1)
> What version of Plasma/KWin are you using?

KDE/Plasma 5.25.1 on Arch Linux

Wayland 1.20.0
Comment 3 Aleix Pol 2022-07-28 14:25:08 UTC 
How about you disable autorandr? It shouldn't have an effect on KWin Wayland anyway.

Do you know if KWin is crashing? Could you provide us with kwin logs and maybe backtraces?
Comment 4 jsdeckerido 2022-07-28 22:26:33 UTC 
Removing autorandr or disabling it just get rid the error messages in the journal log. The hang still occurs.

Sorry that I can't provide more detailed information since I'm clueless about why this occurs as well.

I don't believe KWin crashed, if I had music playing in the background it would continue to play during the hang. The system just won't accept any keyboard mouse input and so the display won't wake up. (Even caps lock won't work)

I'm on Nvidia Ampere gaming GPU, could it be an issue with Nvidia, drm and KDE interacting badly somehow?
Comment 5 Aleix Pol 2022-07-29 11:38:55 UTC 
What we generally do in these cases is ssh into the system and gdb-attach to kwin_wayland to see if it's stuck.

Checking dmesg output would also be useful, especially if it includes the drm extra bits.
Comment 6 jsdeckerido 2022-07-31 05:31:03 UTC 
I have setup sshd just to find out I cannot reproduce this bug anymore. The autorandr things still show up in log but system no longer hangs. Not sure what happened before but I'm closing this for now.

If I have to guess I'd say it was a badly configured usb auto suspend policy causing keyboard/mouse to stop functioning. Not sure though.