Lacking   resources  to do full kernel  commit bisect, "adjacent"   kernels
in  the order of  http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D

we  have last  good kernel
v3.19.8-ckt9-vivid/

first bad  kernel:
v4.0-rc1-vivid/

kernels   tested:
3.19.8ckt4
3.19.8ckt7
3.19.8ckt9
4.0.5
4.0rc1
4.1.2
4.2.1
4.2.5
4.3rc7
I take it all back...  As I was working on my WebGL code just now it
crashed again.  I've attached my Xorg.2.log which clearly shows a
problem:

[  1329.968] (WW) Falling back to old probe method for vesa
[  1332.117] (EE) intel(0): [drm] failed to set drm interface version:
Permission denied [13].
[  1332.117] (EE) intel(0): Failed to claim DRM device.
[  1332.117] (II) UnloadModule: "intel"
[  1332.117] (EE) Screen(s) found, but none have a usable configuration.
[  1332.117] (EE)
Fatal server error:
[  1332.117] (EE) no screens found(EE)
[  1332.117] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[  1332.117] (EE) Please also check the log file at "/var/log/Xorg.2.log"
for additional information.
[  1332.117] (EE)
[  1332.142] (EE) Server terminated with error (1). Closing log file.

What's up with that permissions error?  Also, why is it even getting
such an error so late after running just fine for hours?

** Attachment added: "Xorg.2.log"

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1509556/+attachment/4509620/+files/Xorg.2.log

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Title:
  Kubuntu Wily upgrade screen glitch with  4.2 kernel

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Title:
  Kubuntu Wily upgrade screen glitch with  4.2 kernel

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