Another XWayland-related issue

[Maxim Kartashev]

Thanks for your analysis, Olivier!

FYI: I filed an XOrg issue here:
https://gitlab.freedesktop.org/xorg/xserver/-/issues/1349

On Thu, Jun 2, 2022 at 5:42 PM Olivier Fourdan <ofourdan at redhat.com> wrote:

> 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
>
>