https://bugs.kde.org/show_bug.cgi?id=522982
Bug ID: 522982
Summary: Re enable triple buffering and testing of
KWIN_DRM_DISABLE_TRIPLE_BUFFERING=0 on modern nvidia
hybrid drivers
Classification: Plasma
Product: kwin
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: task
Priority: NOR
Component: platform-drm
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
DESCRIPTION
Request to re enable nvidia triple buffering (on external monitors), this
feature was disabled a long time ago in 6.2 because of #487833, #494547,
#494407 but those issues mainly were fixed, i have tested for 1 hybrid laptop
on 3050 with intel i5 igpu on 595+ nvidia driver version that had re enabled
triple buffering through environment variable
(KWIN_DRM_DISABLE_TRIPLE_BUFFERING=0) removes half fps problem that was
described mainly in nvidia open gpu kernel issue #650. need someone who can
test additionally on other hybrid laptops with modern nvidia drivers
STEPS TO REPRODUCE
1. Connect to hybrid laptop a external monitor
2. Observe half of unstable fps on external monitor through glxgears
STEPS TO TEST
1. Put KWIN_DRM_DISABLE_TRIPLE_BUFFERING=0 in /etc/envoirment if kwin didn't
get variable install kwin source code and change
src/backends/drm/drm_output.cpp at line 50
// from this (disabled triple buffering):
if (m_gpu->atomicModeSetting() && ((!s_disableTripleBufferingSet &&
!m_gpu->drmDevice()->isNvidia()) || (s_disableTripleBufferingSet &&
!s_disableTripleBuffering))) {
// to this:
if (m_gpu->atomicModeSetting() && ((!s_disableTripleBufferingSet && true) ||
(s_disableTripleBufferingSet && !s_disableTripleBuffering)))
And recompile source code
2. Restart or logout and log back in
3. Test with glxgears, in games, in benchmarks, and etc. it should be close to
monitor refresh rate
EXPECTED RESULT
Should be close to refresh of monitor
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window):
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
ADDITIONAL INFORMATION
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