linux-kernel - Re: [REGRESSION] mt8183-kukui: dts: changes in dts caused display to no longer initialize - Was: Re: mt8183-kukui: drm/mediatek: dts: Invalid display hw pipeline when probing mediatek-drm

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Message-ID: <CAFLVeg-qeWu4ntgyqotsgjogPEyhqrMGG=UDWuZe+-D3K8YPTA@mail.gmail.com>
Date: Fri, 6 Feb 2026 17:58:39 +0100
From: Denis Gessert <denisgessert@...il.com>
To: Thorsten Leemhuis <regressions@...mhuis.info>
Cc: "angelogioacchino.delregno@...labora.com" <angelogioacchino.delregno@...labora.com>, 
	Evans Jahja <evansjahja13@...il.com>, Matthias Brugger <matthias.bgg@...il.com>, 
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	regressions@...ts.linux.dev, Otto Pflüger <otto.pflueger@...cue.de>
Subject: Re: [REGRESSION] mt8183-kukui: dts: changes in dts caused display to
 no longer initialize - Was: Re: mt8183-kukui: drm/mediatek: dts: Invalid
 display hw pipeline when probing mediatek-drm

Thanks for the quick response. I compiled 6.18.9 with this patch
(without reverting the previous commit) and it boots successfully.

Cheers,
Denis

Am Fr., 6. Feb. 2026 um 15:55 Uhr schrieb Thorsten Leemhuis
<regressions@...mhuis.info>:
>
> On 2/6/26 12:33, Denis Gessert wrote:
> >
> > I found this email chain while troubleshooting why my Levovo Duet
> > (with the MT8183 chip) would not boot using any 6.18.* kernel.
> >
> > I can confirm that on my device the current stable 6.18.8 does not
> > boot unless I revert the commit
> >
> > commit e72d63fa0563f8a6e98c10fed3a9ce74dc0536e6 (HEAD)
> > Author: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> > Date:   Thu Jul 24 10:39:08 2025 +0200
> >
> >     arm64: dts: mediatek: mt8183: Migrate to display controller OF graph
> >
> > mentioned below. With the reverted commit the device boots as intended.
>
> There is a fix for it from Otto here that I guess should help
> https://lore.kernel.org/lkml/20260106-mt8183-display-graph-v2-1-e7e56054eef5@abscue.de/
>
> Side note: lacks a stable tag and maybe should have been merged this
> cycle instead of the next. But given that 6.19 is immanent it might be
> good if this could be backported to 6.19.y once it landed in mainline.
>
> > PS: Apologies for the potential double-mail.
> No worries, happens.
>
> Ciao, Thortsten