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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On 11/15/23 13:10, Mikhail Gavrilov wrote:
On Tue, Nov 14, 2023 at 11:03 PM Mikhail Gavrilov
<mikhail.v.gavrilov@xxxxxxxxx> wrote:

On Tue, Nov 14, 2023 at 3:55 PM Mikhail Gavrilov
<mikhail.v.gavrilov@xxxxxxxxx> 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@xxxxxxx>
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@xxxxxxx>
     Acked-by: Hersen Wu <hersenxs.wu@xxxxxxx>
     Signed-off-by: Alvin Lee <alvin.lee2@xxxxxxx>
     Tested-by: Daniel Wheeler <daniel.wheeler@xxxxxxx>
     Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>

  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




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