linux-kernel - Re: [REGRESSION] Black screen on HDMI power-cycle after commit 3471b9a31ce3 (7900XTX + LG C3)

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Message-ID: <303ed7b8-fbd3-400d-86ef-ac93c0c5c291@amd.com>
Date: Mon, 8 Dec 2025 15:57:43 -0500
From: Aurabindo Pillai <aurabindo.pillai@....com>
To: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>, amd-gfx list
	<amd-gfx@...ts.freedesktop.org>, Linux List Kernel Mailing
	<linux-kernel@...r.kernel.org>
CC: "Vojvodic, Relja (Reggie)" <Relja.Vojvodic@....com>, "Liu, Wenjing"
	<Wenjing.Liu@....com>, "Deucher, Alexander" <Alexander.Deucher@....com>
Subject: Re: [REGRESSION] Black screen on HDMI power-cycle after commit
 3471b9a31ce3 (7900XTX + LG C3)



On 12/8/25 12:11 PM, Mikhail Gavrilov wrote:
> On Mon, Dec 8, 2025 at 9:42 PM Pillai, Aurabindo
> <Aurabindo.Pillai@....com> wrote:
>>
>> [AMD Official Use Only - AMD Internal Distribution Only]
>>
>> Hi Mikhail,
>>
>> Turns out we had a followup fix for this issue: "drm/amd/display: Improve HDMI info retrieval". Do you have this in your tree?
> 
> Hi Aurabindo,
> 
> No, I do not have this commit in my tree. I am currently testing on
> the mainline Linux repository (Torvalds' tree), and it seems this fix
> hasn't landed there yet.
> 
> I just updated to the latest master (commit c2f2b01b74be) and searched
> for it, but found nothing:
> mikhail@...mary-ws ~/p/g/linux (master)> git remote -v
> origin git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git (fetch)
> origin git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git (push)
> 
> mikhail@...mary-ws ~/p/g/linux (master)> git log --all --grep="Improve
> HDMI info retrieval" -i --oneline
> mikhail@...mary-ws ~/p/g/linux (master)>
> 
> Could you please point me to the tree/branch where this fix is
> located, or send it as a patch? I would be happy to apply it and test
> if it resolves the regression.
>

It is available on amd-staging-drm-next. I'm also attaching here. Let me 
know if this helps.
View attachment "0001-drm-amd-display-Improve-HDMI-info-retrieval.patch" of type "text/x-patch" (2520 bytes)