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Bug#1143161: linux-image-6.12.96+deb13-amd64: X does not start on DisplayPort of NVIDIA Quadro 600 with nouveau

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On Tue, 4 Aug 2026 07:21:36 +0200
Salvatore Bonaccorso <carnil@debian.org> wrote:

> Control: tags -1 + moreinfo
> 
> On Fri, Jul 31, 2026 at 02:28:51PM +0900, Takashi Yano wrote:
> > Package: src:linux
> > Version: 6.12.96-1
> > Severity: normal
> > Tags: patch
> > X-Debbugs-Cc: debian-amd64@lists.debian.org
> > User: debian-amd64@lists.debian.org
> > Usertags: amd64
> > 
> > Dear Maintainer,
> > 
> >    * What led up to the situation?
> >      When starting X on NVIDIA Quadro 600 DisplayPort, X does not start correctly
> >      and does not show screen. I am using nouveau. This also happen with
> >        Quadro 600 / 2000 / 4000
> >        Quadro FX 1800
> >      The issue does not happen if DVI output is used.
> > 
> >    * What exactly did you do (or not do) that was effective (or
> >      ineffective)?
> >      Using another mother board does not help.
> >      After some effort, I found that the attached patch resolves the issue.
> >      This essentially reverts a5a7379f6d9d ("drm/nouveau/kms/nv50-: split DP
> >      disable+enable into two modesets") and adds a workaround for Quadro FX
> >      1800.
> > 
> >    * What was the outcome of this action?
> >      Without the patch, X does not start correctly, while it starts correctly
> >      with the patch.
> > 
> >    * What outcome did you expect instead?
> >      X starts correctly and the screen is shown up.
> 
> Can you please report the problem directly upstream and report here so
> we can update the metadata?

Thanks. Reported: https://bugzilla.kernel.org/show_bug.cgi?id=221852

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>

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Bug#1143161: linux-image-6.12.96+deb13-amd64: X does not start on DisplayPort of NVIDIA Quadro 600 with nouveau Salvatore Bonaccorso <carnil@debian.org> - 2026-08-04 07:30 +0200
  Processed: Re: Bug#1143161: linux-image-6.12.96+deb13-amd64: X  does not start on DisplayPort of NVIDIA Quadro 600 with nouveau "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-08-04 07:30 +0200
  Bug#1143161: linux-image-6.12.96+deb13-amd64: X does not start on DisplayPort of NVIDIA Quadro 600 with nouveau Takashi Yano <takashi.yano@nifty.ne.jp> - 2026-08-08 08:30 +0200
    Bug#1143161: linux-image-6.12.96+deb13-amd64: X does not start on DisplayPort of NVIDIA Quadro 600 with nouveau Salvatore Bonaccorso <carnil@debian.org> - 2026-08-17 21:20 +0200
      Bug#1143161: linux-image-6.12.96+deb13-amd64: X does not start on DisplayPort of NVIDIA Quadro 600 with nouveau Takashi Yano <takashi.yano@nifty.ne.jp> - 2026-08-19 02:10 +0200

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