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

Package:
src:linux
Source:
src:linux
Submitter:
Takashi Yano
Date:
2026-08-19 19:30:08 UTC
Severity:
normal
Tags:
#1143161#5
Date:
2026-07-31 05:28:51 UTC
From:
To:
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.
#1143161#10
Date:
2026-08-04 05:21:36 UTC
From:
To:
Control: tags -1 + moreinfo

Can you please report the problem directly upstream and report here so
we can update the metadata?

Regards,
Salvatore
#1143161#17
Date:
2026-08-08 06:11:43 UTC
From:
To:
On Tue, 4 Aug 2026 07:21:36 +0200 Salvatore Bonaccorso <carnil@debian.org> wrote:
#1143161#28
Date:
2026-08-17 19:11:18 UTC
From:
To:
Hi,

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
#1143161#35
Date:
2026-08-18 23:58:32 UTC
From:
To:
I've sent a mail to them. Thanks.