I have just upgraded my Dell M1330 with Intel GM965 graphics from 12.04 to 13.04 (fresh install).
Now when I plug in an external monitor on HDMI, nothing happens. It seems that HDMI is only detected on boot and when I open screen settings, or run xrandr in a terminal. VGA works, although a bit slow sometimes.
I would report this as a bug, if I wasn't so unsure what the actual reason for the problem actually is.
Can anyone please help me so my computer detects HDMI again ike on 12.04 (where it worked flawlesly)?