Tuesday, January 5, 2016

Kubuntu 15.10 - SDDM crashes

Sometimes sddm-greeter will refuse to start.  The greeter simply presents a blank screen.  A syslog entry shows:

Jan  5 16:24:43 jason-verix kernel: [ 1666.636093] sddm-greeter[2074]: segfault  at 18 ip 00007f49c6e30e38 sp 00007ffdeda61c70 error 4 in libqxcb.so[7f49c6de7000+b5000]

This happened every time.  I tried restarting via systemd:

systemctl restart sddm

This produced the same error.  I tried restarting X with no luck, also pkill'ing X - still no luck.  So, I brought down SDDM:

sudo service sddm stop

and brought it back up

sudo service sddm start

And it came up.  I don't understand why.  Frustrating!

Note that it may be worthwhile delaying the start of sddm to give the video driver more time to initialize the displays.  Another set of problems I was having was resolved by this technique, which is described here:

http://jasontechstuff.blogspot.com/2016/01/kubuntu-wily-1510-kde-upgrade-from-543.html

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