My background is acting very weirdly sometimes. This only solution is to reboot. In fact the top left corner is displaying my whole original background and the rest is completely bugged.
I don't know what info to give you, I have a Dell XPS 13 2015, running ubuntu 14.04
Output of lspci -k | egrep 'VGA|3D' -A2
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09) Subsystem: Dell Device 0665 Kernel driver in use: i915
Output of uname -a
Linux michael-XPS-13-9343 3.13.0-52-generic #86-Ubuntu SMP Mon May 4 04:32:59 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Thank you in advance for every ideas :)