As a workaround I added this line to xsession: xrandr --output VGA --off --output LVDS --auto
And after that gnome-screensaver works again. Might be something to try until the driver is fixed.
-- David Härdeman
I have exactly the same problem (that the driver thinks something is
connected to VGA output on my laptop and gnome-screensaver decides to
show its dialogue on the VGA screen).
- Bug#420292: xserver-xorg-video-intel: gnome-screensaver bl... David Härdeman
