The problem has gone away and direct scanout is working. Now I get 60
FPS fullscreen.
I can only imagine direct scanout wasn't being used for some reason
because if I disable that then I can synthesise this bug again. But
under those circumstances it's really bug 2017097.
** Changed in: glmark2 (Ubuntu)
Status: New => Incomplete
** Changed in: mesa (Ubuntu)
Status: New => Incomplete
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/2017090
Title:
[raspi] glmark2-wayland --fullscreen stutters visually while reporting
hundreds of FPS
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