https://bugs.kde.org/show_bug.cgi?id=415419
Bug ID: 415419
Summary: kwin_x11/intel : screen flickers, large parts are
black, sometimes show stale content
Product: kwin
Version: 5.14.5
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: stefan.schwar...@gmx.net
Target Milestone: ---
SUMMARY
STEPS TO REPRODUCE
1. log in / kde desktop
OBSERVED RESULT
see description, always reproducible
EXPECTED RESULT
well, what a compositing window manager should do...
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: 5.3.0-3-amd64 #1 SMP Debian 5.3.15-1
(available in About System)
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.62 (?)
Qt Version: 5.12.5
ADDITIONAL INFORMATION
Intel CPU with integrated graphics, nvidia optimus, nouveau blacklisted, no
nvidia-drivers installed
(more info below)
The following is basically a quote from debbugs (#deb943585, 27 Oct 2019):
Right after login I get flickering black rectangles on the screen, which
may cover up to 90% of its area. Windows mostly remain black or their content
suddenly becomes visible, the task bar remains black and I see other residuals
of the kde splash screen where windows should be drawn or the background
wallpaper be restored. Swithing to a VT; all seems ok, kwin, the desktop and
applications are running.
So far, my only clue as to what may be going on is a workaroud I found: if I
start a terminal via keyboard shortcut and issue blindly
DRI_PRIME=1 kwin_x11 --replace
then afterwards things behave mostly normally (Sometimes window content is
still not correctly updated). I just picked this line up from older bug reports
against kwin on the net without understanding what it does.
This is the output of kwin following this command in the hope that it helps
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 530
(Skylake GT2)
OpenGL version string: 4.5 (Core Profile) Mesa 19.2.1
OpenGL shading language version string: 4.50
Driver: Intel
GPU class: Unknown
OpenGL version: 4.5
GLSL version: 4.50
Mesa version: 19.2.1
X server version: 1.20.4
Linux kernel version: 5.3
Requires strict binding: yes
GLSL shaders: yes
Texture NPOT support: yes
Virtual Machine: no
-- System Information:
Debian Release: bullseye/sid
APT prefers unstable
APT policy: (990, 'unstable'), (500, 'testing'), (500, 'stable'), (1,
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.3.0-1-amd64 (SMP w/8 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
(tainted module is vmware kernel stuff (patched Workstation 14))
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US
(charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
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