Comment 3 for bug 806556

I checked that again. Unfortunately same behaviour.

First time I plugged HDMI I even had a picture in picture situation,
the external screen showing 640x480 pixel of the ac100 screen. But the
option 'same image in all monitors' of the Monitor preferences GUI was
greyed out.

I then managed to separate the screens, but still I have no
possibilities to modify the resolution of the external screen.

I ask myself if the 16:10 screen is the source of the problem...

2011/7/7 Oliver Grawert <email address hidden>:
> what if you plug it in after boot, do you get the same behavior ?
> might be that reading the EDID data does not work properly if you have connected HDMI on boot.
>
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> Title:
>  HDMI out is limited to 640x480
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