Package: kwin-x11 Version: 4:5.8.2-1+b1 Severity: normal Hi,
Thie ticket might be related to #854372. I have a NVidia GPU, GTX 1070, and have tweaked KWin settings to force keeping window thumbnails in memory and disabled the allow apps to block compositing feature. Now here's the issue, which does not always happen : DO : open a first KDE session w/ desktop effects enabled (SDDM is the login manager used). DO : using the KDE switch user feature, open another KDE session for another user, w/ desktop effects enabled as well and the kwin settings set as above. DO : do some stuff on the second session like opening a browser, working normally and so on, and then log out of this session. EXPECT : the system should switch back to the first session, and when the user enters her password again the first session appears again. ACTUAL : unable to log in back again, the screen is frozen, only mouse moves. You have to switch to VT, run to kill -9 -1 as your user and restart sddm. Note : under KDE 4 w/ Jessie and many backports including the kernel and NVidia driver which were at the same version as w/ Stretch the issue did not occur. So it may be either X related, or Kwin related (or maybe a GPU driver bug). Also note as I've stated in #854372 that kwin is extremely unstable w/ default settings on such hardware (while not at all on other configurations I could test). Hardware : Intel Core i7 4770 32 GB RAM NVidia GeForce 1070 w/ GPU 375.26 binary driver Debian Stretch 9 -- System Information: Debian Release: 9.0 APT prefers testing APT policy: (500, 'testing') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.9.0-1-amd64 (SMP w/8 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (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 4:5.8.2-1+b1 ii libc6 2.24-9 ii libepoxy0 1.3.1-2 ii libgcc1 1:6.3.0-6 ii libkf5configcore5 5.28.0-1 ii libkf5coreaddons5 5.28.0-1 ii libkf5crash5 5.28.0-1 ii libkf5i18n5 5.28.0-1 ii libkf5windowsystem5 5.28.0-1 ii libkwinglutils9 4:5.8.2-1+b1 ii libkwinxrenderutils9 4:5.8.2-1+b1 ii libqt5core5a 5.7.1+dfsg-3+b1 ii libqt5gui5 5.7.1+dfsg-3+b1 ii libqt5widgets5 5.7.1+dfsg-3+b1 ii libqt5x11extras5 5.7.1~20161021-2 ii libstdc++6 6.3.0-6 ii libx11-6 2:1.6.4-3 ii libxcb-cursor0 0.1.1-3 ii libxcb-randr0 1.12-1 ii libxcb-xfixes0 1.12-1 ii libxcb1 1.12-1 ii libxi6 2:1.7.9-1 kwin-x11 recommends no packages. kwin-x11 suggests no packages. -- no debconf information
