--- Begin Message ---
- To: Debian Bug Tracking System <submit@bugs.debian.org>
- Subject: kwin-x11: kwin (?) causes extreme flickering and tear on login
- From: Stefan Schwarzer <stefan.schwarzer@gmx.net>
- Date: Sun, 27 Oct 2019 01:15:10 +0200
- Message-id: <157213171032.16380.885776493328393982.reportbug@nbof16.fritz.box>
Package: kwin-x11
Version: 4:5.14.5-1+b1
Severity: important
Dear Maintainer,
I am following debian unstable, desktop X11/sddm/kde on a Lenovo laptop T460p.
The nvidia graphics on the laptop is disabled in favor of the chipset graphics
(Intel).
After the last upgrade (which was from testing to stable on the 25th October),
I am experiencing a mostly unusable desktop. The login screen (sddm) comes up
as expected,
but 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 he 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: 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 contaent 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
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)
Versions of packages kwin-x11 depends on:
ii kwin-common 4:5.14.5-1+b1
ii libc6 2.29-2
ii libepoxy0 1.5.3-0.1
ii libgcc1 1:9.2.1-12
ii libkf5configcore5 5.62.0-1
ii libkf5coreaddons5 5.62.0-1
ii libkf5crash5 5.62.0-1
ii libkf5i18n5 5.62.0-1
ii libkf5quickaddons5 5.62.0-1
ii libkf5waylandserver5 4:5.62.0-2
ii libkf5windowsystem5 5.62.0-2
ii libkwineffects11 4:5.14.5-1+b1
ii libkwinglutils11 4:5.14.5-1+b1
ii libkwinxrenderutils11 4:5.14.5-1+b1
ii libqt5core5a 5.12.5+dfsg-2
ii libqt5gui5 5.12.5+dfsg-2
ii libqt5widgets5 5.12.5+dfsg-2
ii libqt5x11extras5 5.12.5-1
ii libstdc++6 9.2.1-12
ii libx11-6 2:1.6.8-1
ii libxcb-composite0 1.13.1-2
ii libxcb-cursor0 0.1.1-4
ii libxcb-keysyms1 0.4.0-1+b2
ii libxcb-randr0 1.13.1-2
ii libxcb-render0 1.13.1-2
ii libxcb-shape0 1.13.1-2
ii libxcb-xfixes0 1.13.1-2
ii libxcb1 1.13.1-2
ii libxi6 2:1.7.9-1
kwin-x11 recommends no packages.
kwin-x11 suggests no packages.
-- no debconf information
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