Fresh install of Xubuntu 14.04.1 64 bit on a Toshiba Satellite Pro U300 still suffers from this bug, so it seems that this bug hasn't actually been fixed in this point release, as stated.
I was previously using Ubuntu 14.04.1 64 bit (with Unity) on the same machine without problems.
I tried most (all?) of the solutions above and the only one that worked for me was to blindly run "xrandr --auto" when I get the blank screen.
Fresh install of Xubuntu 14.04.1 64 bit on a Toshiba Satellite Pro U300 still suffers from this bug, so it seems that this bug hasn't actually been fixed in this point release, as stated.
I was previously using Ubuntu 14.04.1 64 bit (with Unity) on the same machine without problems.
I tried most (all?) of the solutions above and the only one that worked for me was to blindly run "xrandr --auto" when I get the blank screen.