KWin crashes on login
Closed, ExpiredPublic


Matthias Klumpp wrote on 17. December 2014 02:49:

Installed T2 on Intel Core 2 Duo 3,06 Ghz processor, 4 GB DDR3 sdram, SATA 500 GB internal HD. Once installation completed, the computer rebooted to the desktop and the following error message displayed:
Kwin – The KDE crash handler Window displayed in the center of the screen detailing that Executable:kwin PID:1145 Signal: Segmentation fault (11).

I closed the Kwin window, restarted the computer; again the Kwin KDE crash handler appears but this time no desktop, only a black screen. I had to turn off the computer manually.

This bug was reported at the forums, see for the discussion.

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Matthias Klumpp wrote on 17. December 2014 02:51:

This looks very much like , although that bug should be fixed in Tanglu (we ship 4.11.11, and it is marked as closed in .10).

Thierry ewolnux wrote on 17. December 2014 02:59:

Same problem on Intel i5-3570K @ 3.40GHz - 8GB RAM - Motherboard: MSI Z77A-G45
Graphics: Intel® HD Graphics 4000

The crash occurs every reboot, so for now take any parameter setting.

Matthias Klumpp wrote on 19. December 2014 01:32:

Meh, this could be any kind of driver issue...
Can you run
@kwriteconfig --file kwinrc --group Compositing --key GLCore false@
on the machine (switch VT with CTL+ALT+F1 (or F2..7), then login and run it) - this should disable OpenGL in KWin and maybe KWin will start then.

Valentin Ovd wrote on 20. December 2014 18:19:

The problem seem to come from sddm. We need some investigation.

Matthias Klumpp wrote on 20. December 2014 22:55:

It's maybe ...

Thierry ewolnux wrote on 22. December 2014 18:04:

For me, the problem is sddm, no kwin.

I open my kde session without using sddm. TTY console > startx = it works very well, no kwin crash.
I removed sddm. I install kdm = it works very well, no kwin crash.

Matthias Klumpp wrote on 25. April 2015 05:48:

If someone has the time, can you please try to reproduce this with the Tanglu 3 Alpha release? It should be fixed there (unfortunately, KWin changed so much that backporting a fix to T2 won't work).

ximion changed the task status from "Open" to "Incomplete".Jul 28 2015, 11:29 AM
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ximion closed this task as "Wontfix".EditedAug 7 2015, 3:51 AM
ximion claimed this task.

I am deeply sorry but I have to mark this as wontfix, as KWin4 was no longer maintained as the bug was reported (and that's why it never was properly resolved), and now since Tanglu 2.0 (Bartholomea annulata) will be end of life in a few months, the chances are almost zero that the issue can be resolved.
In case the error persists with the current KWin in Tanglu 3.0 (Chromodoris willani), that's a different thing, of course. In that case, please report a new bug and we will be working with KDE to get this resolved.
(I have good faith though that the issue has long been fixed in the most recent KWin :-) )
Kind regards,

ximion changed the task status from "Wontfix" to "Expired".Aug 7 2015, 3:51 AM
ximion removed a subscriber: importbot.