https://bugs.kde.org/show_bug.cgi?id=417598
Bug ID: 417598
Summary: Every other frame inside window being dropped
Product: kwin
Version: 5.18.0
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: scene-opengl
Assignee: kwin-bugs-n...@kde.org
Reporter: vas...@gmail.com
Target Milestone: ---
At least with both Firefox and Chrome using the test detailed below, it seems
that my display is only receiving every other frame (with perfect cadence) that
is rendered by the browsers. I've tested with both OpenGL2.1 and 3.0
compositors and can reproduce on both. I cannot reproduce this on Gnome shell.
kwin 5.16 had the same issue a few months ago so this is not a new regression.
STEPS TO REPRODUCE
1. Visit
https://www.testufo.com/blackframes#count=2&bonusufo=1&equalizer=1&background=000000
in either Chrome or FF
OBSERVED RESULT
1. The middle UFO is either completely missing (black frames only being shown)
or twice the expected brightness (black frames not being shown).
2. The topmost and bottommost UFOs are operating at the same speed (visibly,
both show proper framerates according to the browsers - this is a presentation
issue not rendering).
EXPECTED RESULT
1. The middle UFO should look substantially sharper but at the same brightness
and speed as the top UFO. This one is using black-frame-insertion.
2. The bottommost UFO should be showing at twice the framerate (visibly
smoother, usually looks slightly 'ahead' as well).
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch with Plasma 5.18.0
KDE Plasma Version: 5.18.0
KDE Frameworks Version: 5.67.0
Qt Version: 5.14.1
ADDITIONAL INFORMATION
This is using the Nvidia binary driver on X11. I have had other people via
Discord/IRC duplicate the issue, though it may only impact Nvidia users as no
AMD users reported back.
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