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:   Wed, 15 Nov 2023 13:14:39 -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 11/15/23 13:10, Mikhail Gavrilov wrote:
> 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.

What version of DMUB firmware are you on?
The easiest way to find out would be using the following:

# dmesg | grep DMUB

> 
-- 
Hamza