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

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Date:   Fri, 1 Dec 2023 20:05:52 +0100
From:   Oliver Schmidt <oliver@...ed.de>
To:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        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>,
        Mario Limonciello <mario.limonciello@....com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: Fwd: Thinkpad X13 AMD: Problems with external monitor wake up
 after suspend


On 01.12.23 12:37, Thorsten Leemhuis wrote:
> Maybe one of the developers among the recipients has a idea. Oliver, but
> if none of them replies any time soon, it would be best if you'd check
> if 6.6 (and/or 6.7-rc) is affected as well; and if reverting it there
> fixes it, too.

OK, I checked it: compiled a 6.6.3 kernel and got the same suspend-resume
problem as with the 6.1.57 and 6.1.64 kernels. I also was able to revert the
changes of commit ec5fa9 "drm/amd/display: Adjust the MST resume flow" in the
6.6.3 kernel and the problem was solved as in the 6.1.x kernels (however it
seems that resuming with the 6.6 kernel needs a little more time until the
monitor gets signal).

Best regards,
Oliver