On Mon, 30 Jan 2023 at 10:18, Ian MacArthur wrote:
>
> OK, so I tried a few boxes (and also tried WSL2, since I have my Win11 box running anyway; my WSL2 setup is basically Ubuntu 22.04, FWIW.)
>
> The results were mixed: I have one laptop, with Ubuntu 22.04 with an Intel GPU, that behaves as the OP showed, when running in X11 mode. Running in Wayland mode it is fine, no problem.

So... here's an additional observation: on the "failing" laptop, the
mis-behaviour "often" (most times but not always) appears if the view
is in double-buffered mode when I switch it to fullscreen. If the view
is in single-buffer mode, it "usually" works fine.
So it may be an issue with flipping the buffers in the Intel GLX or some such?

Don't really know...

FWIW, I tried a few things, and so long as the GL view is
single-buffered, it basically seems to work OK; if the GL view is
double-buffered, the front buffer does not get consistently updated -
not just resizing to fullscreen, but some other refreshes seem to get
missed too.
And: This may be an alternate explanation for why the test/cube demo
is unaffected, since it is single-buffered.

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