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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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Control: tags -1 + moreinfo

Hi,

On Sat, Aug 08, 2026 at 03:11:43PM +0900, Takashi Yano wrote:
> 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

Thanks for that, though reaching out via bugzilla will probably not
reach the intended audience. Can you actually forward your report to
the following set of addresses:

Ben Skeggs <bskeggs@redhat.com>
Lyude Paul <lyude@redhat.com>
Danilo Krummrich <me@dakr.org>

(from the corresponding commit, plus the following from
get_maintainers.pl output):

Lyude Paul <lyude@redhat.com> (maintainer:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
Danilo Krummrich <dakr@kernel.org> (maintainer:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> (maintainer:DRM DRIVERS AND MISC GPU PATCHES)
Maxime Ripard <mripard@kernel.org> (maintainer:DRM DRIVERS AND MISC GPU PATCHES,authored:1/5=20%,added_lines:34/54=63%,removed_lines:34/52=65%)
Thomas Zimmermann <tzimmermann@suse.de> (maintainer:DRM DRIVERS AND MISC GPU PATCHES,commit_signer:2/5=40%)
David Airlie <airlied@gmail.com> (maintainer:DRM DRIVERS)
Simona Vetter <simona@ffwll.ch> (maintainer:DRM DRIVERS,commit_signer:1/5=20%)

and include the following lists as well

dri-devel@lists.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
nouveau@lists.freedesktop.org (open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS)
linux-kernel@vger.kernel.org (open list)

Thanks already!

Regards,
Salvatore

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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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