Nouveau - Mar 2021 - [PATCH 2/3] drm/nouveau/kms/nv50-: Report max cursor size to userspace

Ilia Mirkin, Sat, Feb 27, 2021 22:26:57 +0100:
> Can you try Alex's patch to modetest and confirm that you see issues
> with modetest? If so, can you (and maybe Alex as well) try an older
> kernel (I'm on 5.6) and see if modetest behaves well there. [The patch
> in question was to expose 256x256 as the 'preferred' size, but
support
> for the larger cursors has been around for a while.] Alex - if you
> have time, same question to you.
Sorry that it took so long. I retestet with the same kernel as Uwe did
(5.4.101) and my results are the same: modetest with 64 and 128 cursors looks
good, 256 broken. Didn't test with X this time (this being my main office
machine), but can do later if required.

On Wed, Mar 3, 2021 at 7:41 AM Alex Riesen <alexander.riesen at
cetitec.com> wrote:
>
> Ilia Mirkin, Sat, Feb 27, 2021 22:26:57 +0100:
> > Can you try Alex's patch to modetest and confirm that you see
issues
> > with modetest? If so, can you (and maybe Alex as well) try an older
> > kernel (I'm on 5.6) and see if modetest behaves well there. [The
patch
> > in question was to expose 256x256 as the 'preferred' size, but
support
> > for the larger cursors has been around for a while.] Alex - if you
> > have time, same question to you.
>
> Sorry that it took so long. I retestet with the same kernel as Uwe did
> (5.4.101) and my results are the same: modetest with 64 and 128 cursors
looks
> good, 256 broken. Didn't test with X this time (this being my main
office
> machine), but can do later if required.
Thanks for confirming! No need to test X - that will work fine, since
we were reporting the smaller cursors on that kernel.

So I think we have definitive evidence that at least all Kepler
doesn't do 256x256 (and it's not just some bug in the display macro
rework that got introduced). And unless I'm blind and don't see the
corruption, Pascal seems fine. Question remains for Maxwell1/2 GPUs.
Unless someone has immediate plans to test on those, I'd recommend
bumping the minimum for 256x256 being reported to Pascal, and doing
128x128 for Kepler / Maxwell.

Simon, Lyude -- thoughts?

Cheers,

  -ilia