linux-kernel - Re: regression/bisected/6.7rc1: Instead of desktop I see a horizontal flashing bar with a picture of the desktop background on white screen

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Message-ID: <CABXGCsPE9=Qp3Jg5hkRsTQoNgODnS_cXFU1d+hg3Baob40AaAA@mail.gmail.com>
Date:   Wed, 15 Nov 2023 23:10:32 +0500
From:   Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To:     alvin.lee2@....com, hersenxs.wu@....com, daniel.wheeler@....com,
        "Deucher, Alexander" <alexander.deucher@....com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>
Subject: Re: regression/bisected/6.7rc1: Instead of desktop I see a horizontal
 flashing bar with a picture of the desktop background on white screen

On Tue, Nov 14, 2023 at 11:03 PM Mikhail Gavrilov
<mikhail.v.gavrilov@...il.com> wrote:
>
> On Tue, Nov 14, 2023 at 3:55 PM Mikhail Gavrilov
> <mikhail.v.gavrilov@...il.com> wrote:
> >
> > Hi,
> > Yesterday came the 6.7-rc1 kernel.
> > And surprisingly it turned out it is not working with my LG C3.
> > I use this OLED TV as my primary monitor.
> > After login to GNOME I see a horizontal flashing bar with a picture of
> > the desktop background on white screen.
> > Demonstration: https://youtu.be/7F76VfRkrVo
> >
> > I made a bisection.
> > And bisect said that the first bad commit is:
> > commit ed6e2782e9747508888f671e1101250bb19045be
> > Author: Alvin Lee <alvin.lee2@....com>
> > Date:   Mon Oct 23 14:33:16 2023 -0400
> >
> >     drm/amd/display: For cursor P-State allow for SubVP
> >
> >     [Description]
> >     - Similar to FPO, SubVP should also force cursor P-State
> >       allow instead of relying on natural assertion
> >     - Implement code path to force and unforce cursor P-State
> >       allow for SubVP
> >
> >     Reviewed-by: Samson Tam <samson.tam@....com>
> >     Acked-by: Hersen Wu <hersenxs.wu@....com>
> >     Signed-off-by: Alvin Lee <alvin.lee2@....com>
> >     Tested-by: Daniel Wheeler <daniel.wheeler@....com>
> >     Signed-off-by: Alex Deucher <alexander.deucher@....com>
> >
> >  drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c | 17 ++---------------
> >  1 file changed, 2 insertions(+), 15 deletions(-)
> >
> > My hardware specs: https://linux-hardware.org/?probe=1c989dab38
> >
> > --
> > Best Regards,
> > Mike Gavrilov.
>
> I forgot kernel logs. Not sure it would be helpful because I didn't
> notice anything unusual.
>

This only appears on 7900XTX and 120Hz.

-- 
Best Regards,
Mike Gavrilov.