Same problem here. I rarely had this problem previously with Ubuntu 14.04, but since updated to Ubuntu 16.04 I am suffering this issue very often.
The problem mainly appears when trying to resume the laptop from suspend. Mine has already installed xserver-xorg-video-intel. The laptop has an intel HD Graphics 4400 video adapter, the one integrated within the Core i7-4510U CPU
Same problem here. I rarely had this problem previously with Ubuntu 14.04, but since updated to Ubuntu 16.04 I am suffering this issue very often.
The problem mainly appears when trying to resume the laptop from suspend. Mine has already installed xserver- xorg-video- intel. The laptop has an intel HD Graphics 4400 video adapter, the one integrated within the Core i7-4510U CPU
$ lspci
...
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)