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

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Message-ID: <8da256ea-b069-44f0-9cc2-93482c2f5eec@gmail.com>
Date:   Fri, 1 Dec 2023 07:30:40 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux AMDGPU <amd-gfx@...ts.freedesktop.org>
Cc:     Wayne Lin <wayne.lin@....com>, Stylon Wang <stylon.wang@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Schmidt <oliver@...ed.de>
Subject: Fwd: Thinkpad X13 AMD: Problems with external monitor wake up after
 suspend

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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