Bugzilla – Bug 1179226
System hang related to power saving
Last modified: 2022-01-21 12:14:15 UTC
# Issue :
Screen and input devices would stop responding (black screen, no TTY), as soon as the computer goes into some low power mode.
It can be triggered by locking the screen in Gnome (through gdm), and can also be reproduced in XFCE / LightDM by just leaving the computer for a while.
# Impact :
- black screen, no TTY access
- unresponsive system (impossible to launch new processes, reboot, no way to switch init3 & init 5, etc.)
- SSH/network access still available, existing process seem to run
Moreover, no related log entry, no error (journalctl, dmesg...).
# Notes :
Hardware is very likely to be fine :
- no issue with a Fedora LiveUSB ;
- memtest tests passed.
# Hardware :
Intel(R) Celeron(R) J4005 CPU @ 2.00GHz
Intel Corporation UHD Graphics 605 (rev 03)
I have no idea on how to debug it further. My huntch is that it is power saving related with Intel chipset.
Created attachment 843882 [details]
Created attachment 843883 [details]
Likely the same i915 bug as tracked in bug 1179092 and bug 1178474.
It could be, but the impact on my computer is much more serious.
It becomes totally unusable.
They also don't mention power management, and I can reproduce the crash.
So I am not totally sure that it's related.
Also, I have settled Caffeine to make sure that the screen never goes off.
And thanks to that the computer has not crashed for the last 2 days.
(In reply to jean-christophe baptiste from comment #4)
> It could be, but the impact on my computer is much more serious.
> It becomes totally unusable.
What do you mean "unusable"? Can you never recover the graphics?
In many cases, Linux console seems still working via switching to VT. Or, (killing and) starting a new session seems working.
> They also don't mention power management, and I can reproduce the crash.
I guess a few reports that don't appear in Bugzilla but reported on opensuse-factory ML mentioned about the suspend/resume.
> So I am not totally sure that it's related.
No one really knows yet, and a crystal ball doesn't tell you a true story :)
> What do you mean "unusable"? Can you never recover the graphics?
Totally unrecoverable. It was what I meant when I wrote "no access to TTY" :
> - unresponsive system (impossible to launch new processes, reboot, no way to switch init3 & init 5, etc.)
Could you check with 5.10-rc kernel in OBS Kernel:HEAD repo?
Most users reported that the issue is gone with the 5.10-rc.
No response, closing.