Another XWayland-related issue

[Olivier Fourdan]

Hi Maxim,

On Thu, Jun 2, 2022 at 4:19 PM Maxim Kartashev
<maxim.kartashev at jetbrains.com> wrote:
> […]
>
> If you have seen this one before and/or have a suggestion on how to further
> narrow down the bug's cause, please respond.
>
> P.S. I have only looked at this inside a VMWare virtual machine instance,
> so not 100% sure that this can be seen on "real" hardware.
>
> Ref:
> https://bugs.openjdk.java.net/browse/JDK-8287731

Since disabling glamor gets rid of the issue, then the root cause is
between GLAMOR (in the Xserver) and the underlying GL implementation.

For example I reckon the somehow similar rendering issue [2] reported
by Alexander is more of a GL implementation bug in the virtualization
stack than GLAMOR (GLAMOR being used by Xwayland and Xorg with
modesetting for example).

So to help narrow the issue, the next thing would be to reproduce on
real hardware.

FWIW, I just tried that on my intel laptop here and I could not
reproduce the issue, no matter how many times I repeated the test.

I also tried on an NVIDIA laptop with the NVIDIA proprietary driver
(to test another GL implementation, not just Mesa) and it works as
well.

So I suspect this is the same as with [2], it's possibly more of a GL
implementation issue in the virtualization stack.

Cheers
Olivier

[2] https://gitlab.freedesktop.org/xorg/xserver/-/issues/1333