KDE no longer starts after login

[mls at xlist.pw]

On Sunday 30 March 2014 14:13:08 Ralf Mardorf wrote:
> Did you check the log files?
> 
> User session:
> $ cat ~/.xsession-errors
I don't see anything that is written to. To ensure I removed the file and 
rebooted and logged in again. The file is not recreated. 
> 
> Kernel's ring thingy:
> $ sudo less /var/log/dmesg
Nothing special in it. Same for /var/log/Xorg.0.log.

Thanks for your help.