linux-kernel - Re: [PATCH] drm/nouveau: check ioctl command codes better

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Message-Id: <d5010230-b718-4770-b731-f62225f1f808@app.fastmail.com>
Date: Tue, 22 Jul 2025 12:52:30 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Chris Bainbridge" <chris.bainbridge@...il.com>,
 "Satadru Pramanik" <satadru@...il.com>
Cc: "Arnd Bergmann" <arnd@...nel.org>, "Dave Airlie" <airlied@...il.com>,
 "Dave Airlie" <airlied@...hat.com>, "Ben Skeggs" <bskeggs@...dia.com>,
 "bskeggs@...hat.com" <bskeggs@...hat.com>,
 "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
 "open list" <linux-kernel@...r.kernel.org>, "Lyude Paul" <lyude@...hat.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 "Simona Vetter" <simona@...ll.ch>, "Timur Tabi" <ttabi@...dia.com>,
 "Thomas Zimmermann" <tzimmermann@...e.de>, regressions@...ts.linux.dev
Subject: Re: [PATCH] drm/nouveau: check ioctl command codes better

On Tue, Jul 22, 2025, at 12:29, Chris Bainbridge wrote:
> On Mon, Jul 21, 2025 at 08:22:48AM -0400, Satadru Pramanik wrote:
>> Hello all,
>> 
>> I suspect this commit in 6.16-rc7 has broken acceleration with Mesa's
>> nouveau drivers on my machine.
>> 
>> glxinfo -B reports that I'm using llvmpipe.
>> 
>> Reverting this in 6.16-rc7 restores nouveau acceleration, and glxinfo
>> then reports: "OpenGL renderer string: NVE7"
>
> I also bisected an issue to this commit. On my laptop, this commit
> results in an intermittent desktop crash (Xorg segfault) when changing
> display scale, which can be more reliably reproduced with:
>
> for x in {1..100}; do
>   xrandr --output eDP-1 --mode 2560x1600 --scale 0.5 --filter nearest
>   xrandr --output eDP-1 --mode 2560x1600 --scale 1 --filter nearest
> done
>

I won't have time to work on fixing my patch before the merge window,
let's just revert it.

      Arnd