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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Date: Fri, 15 Dec 2023 11:14:16 -0500
From: Hamza Mahfooz <hamza.mahfooz@....com>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>, 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 11/14/23 05:55, Mikhail Gavrilov 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

Can you try the following patch with old fw (version 0x07002100 should
be fine)?: https://patchwork.freedesktop.org/patch/572298/

> 
-- 
Hamza