Your message dated Tue, 11 Feb 2020 15:19:40 +0100
with message-id <3419414.9LKvrY20dy@grumly>
and subject line [fixed] Re: Bug#943585: bug gone with kwin-x11 version 5.17 
from experimental
has caused the Debian Bug report #943585,
regarding kwin-x11: kwin (?) causes extreme flickering and tear on login
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
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--- Begin Message ---
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

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
cover up to 90% of its area. Windows mostly remain black or their content
becomes visible he task bar remains black and I see other residuals of the kde
screen where windows should be drawn or the background wallpaper be
restored. Swithing to a VT; all seems ok, kwin, the desktop and applications

So far, my only clue as to what may be going on is a workaroud: if I start a
via keyboard shortcut and issue blindly
        DRI_PRIME=1 kwin_x11 --replace
then afterwards things behave mostly normally (Sometimes window contaent is
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, 
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.3.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US 
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

--- End Message ---
--- Begin Message ---
Version: 4:5.17.5-1

Le mardi 11 février 2020, 14:41:42 CET Stefan Schwarzer a écrit :
> Hi,
> I updated kwin-x11 yesterday from experimental from version 5.14 to 5.17.
> For me, the erratic behavior of the window manager is gone.
> Thanks to all.

And thanks for the follow up.
I’m marking this bug as closed in the experimental version.

Happy hacking !

--- End Message ---

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