linux-kernel - Re: [PATCH 0/2] Add quirk to disable PSR 2 on Tongfang PHxTxX1 and PHxTQx1

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Message-ID: <647c8ea1-4f3d-1538-a78f-b71122e9c4f9@tuxedocomputers.com>
Date:   Wed, 22 Feb 2023 16:39:06 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...il.com, daniel@...ll.ch, jose.souza@...el.com,
        jouni.hogander@...el.com, mika.kahola@...el.com,
        ville.syrjala@...ux.intel.com, lucas.demarchi@...el.com,
        Diego.SantaCruz@...netix.com, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Add quirk to disable PSR 2 on Tongfang PHxTxX1 and
 PHxTQx1


Am 22.02.23 um 15:17 schrieb Werner Sembach:
> On these Barebones PSR 2 is recognized as supported but is very buggy:
> - Upper third of screen does sometimes not updated, resulting in
> disappearing cursors or ghosts of already closed Windows saying behind.
> - Approximately 40 px from the bottom edge a 3 pixel wide strip of randomly
> colored pixels is flickering.
>
> PSR 1 is working fine however.
>
> This patchset introduces a new quirk to disable PSR 2 specifically on known
> buggy devices and applies it to the Tongfang PHxTxX1 and PHxTQx1 barebones.
>
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> Cc: <stable@...r.kernel.org>
>
>
Parralel to this there is a patch fixing the root cause of this issue: 
https://gitlab.freedesktop.org/drm/intel/-/issues/7347#note_1785094

So this quirk might only be relevant for stable kernels, depending on when that 
other patch gets merged.