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 19:18:55 -0400
From:   Leo Li <sunpeng.li@....com>
To:     August Wikerfors <git@...ustwikerfors.se>,
        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 August,

I've sent a fix here: https://patchwork.freedesktop.org/patch/504993/

It's not the most ideal fix, but it should address the regression. Let 
me know it works for you.

Thanks!
Leo

On 2022-09-27 10:22, August Wikerfors wrote:
> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2F-%2Fsnippets%2F7076&amp;data=05%7C01%7Csunpeng.li%40amd.com%7Ca5864225840b4bbbd04c08daa093bb26%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637998853607058272%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=cNAK%2FMhWCGwXySpITTTvKtzXQ7WCEQL4DYSrPKzWSkY%3D&amp;reserved=0
> 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