The same bug occurs in weston so that's some good news that it's not a
mutter bug.
The console output mentions GDK is unable to create a GL context and is
falling back to glReadPixels. And that's exactly what the corruption
looks like -- an incorrect stride or pixel format with glReadPixels.
That makes it a GDK bug.
** Package changed: mutter (Ubuntu) => gtk+3.0 (Ubuntu)
** Changed in: gtk+3.0 (Ubuntu)
Assignee: Daniel van Vugt (vanvugt) => (unassigned)
** Also affects: yelp (Ubuntu)
Importance: Undecided
Status: New
** Also affects: webkit2gtk (Ubuntu)
Importance: Undecided
Status: New
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
** Tags added: wayland wayland-session
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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1924251
Title:
Embedded browser display corruption under Wayland on Pi desktop
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