https://bugs.kde.org/show_bug.cgi?id=385692
Bug ID: 385692
Summary: Application windows (such as scrolling in kate) on EGL
flickers.
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@davidedmundson.co.uk
Target Milestone: ---
I have the issue Marco described on the mailing list.
Symptoms:
- open a big file in kate
- scroll quickly
- flickers like crazy
This happens on kate, but never gedit
Marco says this doesn't happen in Weston
This does happen on neseted wayland sessions
It doesn't happen on testRenderingServer in kwayland (which is SHM based)
I'm pretty confident the real bug is in the QPA, but I'll track it here.
We can see in wayland debug:
[2180114.022] -> wl_surface@40.frame(new id wl_callback@226)
[2180114.066] -> wl_surface@40.attach(wl_buffer@160, 0, 0)
[2180114.208] -> wl_surface@40.damage(529, 40, 2, 438)
[2180114.255] -> wl_surface@40.damage(33, 478, 498, 2)
[2180114.303] -> wl_surface@40.commit()
[2180114.324] -> wl_surface@40.frame(new id wl_callback@139)
[2180114.360] -> wl_surface@40.attach(wl_buffer@160, 0, 0)
[2180114.405] -> wl_surface@40.damage(33, 38, 498, 2)
[2180114.442] -> wl_surface@40.damage(33, 40, 2, 438)
[2180114.492] -> wl_surface@40.damage(529, 40, 2, 438)
[2180114.538] -> wl_surface@40.damage(33, 478, 498, 2)
[2180114.585] -> wl_surface@40.commit()
...
[2180120.358] wl_buffer@160.release()
[2180120.378] wl_buffer@160.release()
This looks to me like it's attaching the same buffer twice (and in some cases
4/5 times) before getting the release of the buffer
We could be reading those pixels after the first commit; hence flicker
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