staring x with an resoltion higher than 1024x768 doesn't work in i965 chipset. setting the res manually afterwards with xrandr -s 1680x1050 works.
Created attachment 11778 [details] X org log file
Created attachment 11779 [details] xorg .conf
By default the server will start both outputs (internal LVDS and external panel, in your case) at the closest resolution to each other possible. This can be overridden using PreferredMode in current server. Keith intends it to work this way.
> This can be overridden using PreferredMode in current server. Which is already used in xorg.conf, but obviously doesn't help. :-( See also https://bugzilla.novell.com/show_bug.cgi?id=257746
Maybe related to https://bugs.freedesktop.org/show_bug.cgi?id=10625 ? PreferredMode was ignored for me on TMDS-1 before Keith's patch.
Indeed this looks like a duplicate.
*** This bug has been marked as a duplicate of bug 10625 ***
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