RE: [REGRESSION] Laptop with Ryzen 4600H fails to resume video since 5.17.4 (works 5.17.3)

From: "Limonciello, Mario" <Mario.Limonciello@amd.com>
To: "casteyde.christian@free.fr" <casteyde.christian@free.fr>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>,
	Thorsten Leemhuis <regressions@leemhuis.info>,
	"regressions@lists.linux.dev" <regressions@lists.linux.dev>,
	"Deucher, Alexander" <Alexander.Deucher@amd.com>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: RE: [REGRESSION] Laptop with Ryzen 4600H fails to resume video since 5.17.4 (works 5.17.3)
Date: Thu, 19 May 2022 18:07:31 +0000	[thread overview]
Message-ID: <MN0PR12MB6101D7AB5BC33430A8492E0AE2D09@MN0PR12MB6101.namprd12.prod.outlook.com> (raw)
In-Reply-To: <MN0PR12MB6101FA3FF375A961E67AE89CE2D09@MN0PR12MB6101.namprd12.prod.outlook.com>

[Public]

> 
> In addition to my other ask somewhere in this thread for increased
> debugging
> output to find your "real" problem, please give a try of this combo:
> 
> 1) 5.18-rc7
> 2) Patch turning off reset on dGPUs in s2idle
> 3) The below patch
> 
> This patch should do pretty much the same thing, try to recover your GPU
> when
> it's in this bad state. Now it happens somewhere more sustainable and
> sensible:
> on the resume path.  I think this might get you a functional display rather
> than that
> "black screen" from the failed suspend cycle.  It's still papering over your real
> issue
> of whatever caused the failed suspend.
> 

I noticed the reset doesn't redo the HW init, that's still another needed step.

So here's a proper link to the patch you can apply as an mbox:
https://patchwork.freedesktop.org/patch/486836/
This is untested.