I'm sorry I forgot the link : https://bugs.launchpad.net/ubuntu/+source/xorg/+filebug/040575ce-6f5b-11e6-a147-d485646cd9a4
I'm sorry I forgot the link : https:/ /bugs.launchpad .net/ubuntu/ +source/ xorg/+filebug/ 040575ce- 6f5b-11e6- a147-d485646cd9 a4