I forgot, you also need to disable this option for the user ('sudo -u
gdm' will only deal with the gdm login screen):

gconftool-2 --type bool -s
"/apps/gnome_settings_daemon/xrandr/turn_on_external_monitors_at_startup"
false

I guess the easiest way to find out if you are affected by this bug is,
to install the x11-xserver-utils package and run 'xrandr -q' - normally
this should list a proper mode - it doesn't in my case. You can also run
'sudo get-edid' from the read-edid package - if it fails, you'll likely
hit this bug.

-- 
Forces low refresh rate on CRT monitor
https://bugs.launchpad.net/bugs/640807
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