A workaround for ubuntu 14.04 with nvidia driver is to disable backing store in xorg:
Make sure you have the "-bs" option in lightdm config file:
cat /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
[SeatDefaults]
# Dump core
xserver-command=X -bs -core
A workaround for ubuntu 14.04 with nvidia driver is to disable backing store in xorg:
Make sure you have the "-bs" option in lightdm config file: lightdm/ lightdm. conf.d/ 50-xserver- command. conf
cat /usr/share/
[SeatDefaults]
# Dump core
xserver-command=X -bs -core