My computer has aquired some problems after upgrading to Kubuntu 15.10 from 15.04:
It restarts when I shut it down, which makes it impossible to shut it down.
The resolution of the external monitors is too low.
I have noticed the following error message that shows up every time I start or shuts down the computer:
drm:intel_pipe_config_compare [i915]] *error* mismatch in ips_enabled
What does that mean? Are the problems related to this error message? and how do I fix it?
I can answer your last question. It's a kernel bug with the Intel graphics: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1492764
Some people reported it as fixed in Linux Kernel 4.3, but it wasn't verified as of this posting. If you think you need to, you can manually update to the new kernel: http://www.ubuntumaniac.com/2015/10/how-to-upgrade-to-linux-kernel-43-rc7.html
As for your resolution problem, a Google search and a couple bounces later, I found this: Can't set a higher screen resolution in a external display in a Dell Mini 10v laptop
It's old, but it might do the trick. Interestingly enough, the bug listings linked in the question are marked as Invalid and/or Won't Fix, and they're claimed as a bug with the driver instead of compiz. Possibly linked to your previous bug with the Intel graphics drivers? https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/830949
