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: <CABXGCsNY2aR93pX0AtWUZ1v0QLj3ANoDmS13HCcdN-c4htHbtg@mail.gmail.com>
Date: Mon, 18 Dec 2023 02:39:25 +0500
From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To: Hamza Mahfooz <hamza.mahfooz@....com>
Cc: 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 Fri, Dec 15, 2023 at 9:14 PM Hamza Mahfooz <hamza.mahfooz@....com> wrote:
>
> Can you try the following patch with old fw (version 0x07002100 should
> be fine)?: https://patchwork.freedesktop.org/patch/572298/
>

Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com> on 7900XTX hardware.

Can I ask?
What does SubVP actually do?
I read on Phoronix that this is new feature of DCN 3.2 hardware
https://www.phoronix.com/news/AMDGPU-Linux-6.5-Improvements
But I didn't notice that anything began to work better after enabling
this feature.
On the contrary, my kernel logs began to become overgrown with
unpleasant errors.
See here: https://gitlab.freedesktop.org/drm/amd/-/issues/2796
I bisected this issue and bisect heads me to commit
299004271cbf0315da327c4bd67aec3e7041cb32 which enables SubVP high
refresh rate.
But without SubVP I also had 120Hz and 4K. So I ask again what is the
profit of SubVP?

-- 
Best Regards,
Mike Gavrilov.