On 3/3/21 8:51 AM, Lyude Paul wrote:
On Wed, 2021-03-03 at 08:12 -0500, Ilia Mirkin wrote:
On Wed, Mar 3, 2021 at 7:41 AM Alex Riesen <alexander.riesen@xxxxxxxxxxx>
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.
I'm fairly sure this will actually work fine on maxwell, I think Kepler is the
only one I'm aware of so far that has issues with this. I've got one of each gen
from kepler 1 up to ampere, so I'll try to find some today to test the cards
I've got and see where the support cutoff for this is and then submit a patch
for the time being.
It's also really strange to me that this would be present in the display classes
yet not be supported on the GPU, since there definitely aren't any capabilities
for this. I'll also send an email to Andy and see if he might know what's going
on here.
FWIW, it's not my area, but I've been following, and forwarded this
thread around internally. We discussed a bit, and Kepler definitely
supports 256x256 cursors. One suggestion was if you aren't already, try
using 4k pages. The rest was a bit beyond me, so I'll let Andy and Lyude
discuss further if needed.
Thanks,
-James
Simon, Lyude -- thoughts?
Cheers,
-ilia
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