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[D <dennis@xxxxxxxxx>]

So i tried a new clean install with 15.10 and now it works very nicely!
I'm suspecting the upgrades from 14.10/15.04 or the troubleshooting
steps have broken something.

I also got a reason why the 2x4k and 1x2k resolution does not work;
"exceeds 3D hardware limit (8191, 8192)"
I made a screenshot of the full error. 

I'm still curious if this could be fixed in Ubuntu as it does seem to
work in Windows. It might not be a serious issue and not at all required
for me, but if this proves to be an underlying issue in Ubuntu with
higher resolutions this might be a problem in the future with all the
high-res screens that are coming.

** Attachment added: "exceeds 3D hardware limit.png"
   https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1459613/+attachment/4531044/+files/exceeds%203D%20hardware%20limit.png

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https://bugs.launchpad.net/bugs/1459613

Title:
  connecting 2x 4k screens on a Dell XPS12 (9Q33): compiz crashed with
  SIGSEGV in GLTexture::matrix() from GLScreen::glPaintCompositedOutput

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