My fonts, windows are often affected by graphic distorisions, bugs, sometimes disapear without any reasons.
When I reboot it is generally solved.
This is happening since I update my kernel and graphics, but I don't know how to solve it.
I have a Dell XPS 13 running ubuntu 14.04, with Intel HD5500.
Output of lspci -k | grep VGA -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 dpkg -l | grep xserver-xorg-core
rc xserver-xorg-core 2:1.15.1-0ubuntu2.7 amd64 Xorg X server - core server ii xserver-xorg-core-lts-utopic 2:1.16.0-1ubuntu1.2~trusty2 amd64 Xorg X server - core server