I don't know what triggers this crash, but it occurs with a certain regularity. My screen turns black and does not come back to life (tried CTRL-ALT F1 to switch to text console). Logging in from another computer via ssh shows the following dmesg entries: Sep 28 14:05:37 kernel: [ 802.055851] show_signal_msg: 45 callbacks suppressed Sep 28 14:05:37 kernel: [ 802.055855] kactivitymanage[1656]: segfault at 18 ip 00007fd7b1eeef00 sp 00007fff2b09b628 error 4 in libqxcb.so[7fd7b1ec0000+b9000] Sep 28 14:05:38 kernel: [ 803.171033] kwin_x11[2171]: segfault at 18 ip 00007f69612b2059 sp 00007ffd94054b10 error 4 in libqxcb.so[7f6961268000+b9000] Sep 28 14:05:38 kernel: [ 803.171061] krunner[2173]: segfault at 18 ip 00007f1ce3784059 sp 00007ffdd2e6b1e0 error 4 in libqxcb.so[7f1ce373a000+b9000] Sep 28 14:05:38 kernel: [ 803.171985] plasmashell[2174]: segfault at 18 ip 00007fce8512c059 sp 00007ffd46b31850 error 4 in libqxcb.so[7fce850e2000+b9000] Sep 28 14:05:39 kernel: [ 804.166468] klauncher[2186]: segfault at 18 ip 00007fa7b12d2059 sp 00007ffe2f0df1b0 error 4 in libqxcb.so[7fa7b1288000+b9000] Sep 28 14:07:35 systemd[1]: Starting Cleanup of Temporary Directories... Sorry for not being able to provide more specific information... please let me know if and how I can provide more info. I rank this problem critical since it crashes the entire desktop. Reproducible: Sometimes
apparently something in libqxcb.so (ie. in Qt) - thus also the crash in various processes. How many screens do you have?
I have one single screen, resolution 2560 x 1440, connected via DisplayPort to a DH87RL board, using the processors integrated graphics. The crash happened without me turning off the screen.
You don't need to "turn it off" - changing the resolution can be sufficient (it's only something that predominantly hits ppl. with several screens as they change the configuration a lot. Any randr event is sufficient, though :-(