Fwd: Thinkpad X13 AMD: Problems with external monitor wake up after suspend

[Bagas Sanjaya]

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> Since kernel version 6.1.57 I have problems with external monitor wakeup after suspend on Thinkpad X13 AMD Gen2 Notebook.
> 
> Notebook is in docking station with closed lid. Suspend & Resume. The external monitor gets no signal. After randomly typing Ctrl+Alt+Fn for switchung consoles, the monitor at some point gets signal and is usable again.
> 
> It worked with kernel 6.1.56.
> 
> I managed to compile a 6.1.57 kernel and also a 6.1.64 kernel by reverting the changes from commit ec5fa9 "drm/amd/display: Adjust the MST resume flow" (https://github.com/torvalds/linux/commit/ec5fa9fcdeca69edf7dab5ca3b2e0ceb1c08fe9a?diff=split&w=1?diff=split&w=1) and with this suspend & resume worked like before without any problems.
> 
> I reported this also to the Manjaro's support forum, since I tried this on Manjaro Linux (https://forum.manjaro.org/t/problems-with-external-monitor-wake-up-after-suspend/151840).

See Bugzilla for the full thread.

Anyway, I'm adding this regression to regzbot:

#regzbot introduced: ec5fa9fcdeca69 https://bugzilla.kernel.org/show_bug.cgi?id=218211
#regzbot title: MST resume flow adjustment breaks external monitor wakeup after suspend on Thinkpad X13
#regzbot link: https://forum.manjaro.org/t/problems-with-external-monitor-wake-up-after-suspend/151840

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=218211

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