Confirmed on Xubuntu 14.04 on Dell Inspiron 3521, which has a dual GPU (Intel/AMD). Removing light-locker and installing xscreensaver (I already had it installed -- probably had it since 13.04?) is a successful workaround.
Confirmed on Xubuntu 14.04 on Dell Inspiron 3521, which has a dual GPU (Intel/AMD). Removing light-locker and installing xscreensaver (I already had it installed -- probably had it since 13.04?) is a successful workaround.