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

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Message-ID: <CABXGCsNZcGXPe_nmRE3fUUMGfnGB_Bc1+R+=JMrymd0LN8Z9xg@mail.gmail.com>
Date: Tue, 9 Dec 2025 04:34:51 +0500
From: Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
To: Aurabindo Pillai <aurabindo.pillai@....com>
Cc: amd-gfx list <amd-gfx@...ts.freedesktop.org>, 
	Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, 
	"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 Tue, Dec 9, 2025 at 1:57 AM Aurabindo Pillai
<aurabindo.pillai@....com> wrote:
>
> It is available on amd-staging-drm-next. I'm also attaching here. Let me
> know if this helps.

Hi Aurabindo,

I applied the patch you provided ("drm/amd/display: Improve HDMI info
retrieval"), but unfortunately, it does not resolve the issue.

The behavior remains exactly the same: the HDMI signal is still lost
after power-cycling the TV.

I have attached a new dmesg log (captured with drm.debug=0x116) with
your patch applied. Hopefully, it shows why the fix didn't work.

-- 
Best Regards,
Mike Gavrilov.

Download attachment "dmesg-6.18.0-a110f942672c-with-fix.zip" of type "application/zip" (7173 bytes)