[Intel-gfx] [5.18 regression] drm/i915 BYT rendering broken due to "Remove short-term pins from execbuf, v6"

[Tvrtko Ursulin]

On 08/05/2022 15:38, Hans de Goede wrote:
> Hi All,
> 
> When running a 5.18-rc4 (and -rc5) kernel on a Chuwi Hi 8, which is
> a Bay Trail based tablet with 2G RAM and a 1200x1920 DSI panel.
> I noticed that gnome-shell was misrendering. Many UI elements were
> missing (they were all black) and at the gdm login screen (which is
> a special gnome-shell session) the screen often was entirely black
> until I move the cursor around and then various things got
> highlighted after which they sometimes stuck around and sometimes
> they disappeared again after the highlight.
> 
> Since this problem does not happen with various 5.17.y kernels I
> believe that this is a kernel regression in 5.18. I've bisected this
> and the bisect points to:
> 
> commit b5cfe6f7a6e1 ("drm/i915: Remove short-term pins from execbuf, v6.")
> 
> from Maarten. This commit cleanly reverts on top of 5.18-rc5 and
> I can confirm that 5.18-rc5 with b5cfe6f7a6e1 reverted fixes things.
> 
> I would be more then happy to test any possible fixes for this.

For reference the same commit was identified for a GM45 regression here:

https://gitlab.freedesktop.org/drm/intel/-/issues/5806

Regards,

Tvrtko