linux-kernel - Re: [REGRESSION] Graphical issues on Lenovo Yoga 7 14ARB7 laptop since v6.0-rc1 (bisected)

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Date:   Tue, 27 Sep 2022 16:22:28 +0200
From:   August Wikerfors <git@...ustwikerfors.se>
To:     Leo Li <sunpeng.li@....com>, Alex Deucher <alexdeucher@...il.com>
Cc:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Harry Wentland <harry.wentland@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        regressions@...ts.linux.dev
Subject: Re: [REGRESSION] Graphical issues on Lenovo Yoga 7 14ARB7 laptop since
 v6.0-rc1 (bisected)

Hi Leo,

On 2022-09-27 00:29, Leo Li wrote:
> 
> Hi August, thanks for the log.
> 
> It seems the eDP panel does not fully satisfy the amdgpu requirements
> for enabling PSR SU, but we're enabling it anyways.
> 
> I suspect it may be due to the "DP_FORCE_PSRSU_CAPABILITY" bit being set
> in it's DPCD registers, I'm checking with some devs to see if that is
> expected.
> 
> In the meantime, can you give these two hacks a spin? Let me know if
> this helps with the glitches and system hangs:
> https://gitlab.freedesktop.org/-/snippets/7076
Yes, the issues do not happen with those patches applied.

> Also the dmesg, in particular this line:
>> [drm] PSR support 1, DC PSR ver 1, sink PSR ver 3 DPCD caps 
>> 0x70su_y_granularity 4 force_psrsu_cap **X**
Here is that line:
> [   12.085196] [drm] PSR support 1, DC PSR ver 1, sink PSR ver 3 DPCD caps 0x7b su_y_granularity 4 force_psrsu_cap 1

Regards,
August Wikerfors