Public bug reported:

 On P4M900 I was not able to change the mode/resolution as desired with
the xrandr command. Montor is a small TFT touchscreen with 800x600
native resolution. As this is a TFT refresh rate/clock is restricted
around 60Hz. However VGA-1 output is wrongly identified as
'(1280x960+0+0)':

$ xrandr --fb 800x600 --fbmm 800x600 --rate 60 
xrandr: specified screen 800x600 not large enough for output VGA-1 
(1280x960+0+0)

** Affects: openchrome
     Importance: Unknown
         Status: Unknown

** Affects: xserver-xorg-video-openchrome (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: quantal

** Tags added: quantal

** Bug watch added: OpenChrome Trac #440
   http://www.openchrome.org/trac/ticket/440

** Also affects: openchrome via
   http://www.openchrome.org/trac/ticket/440
   Importance: Unknown
       Status: Unknown

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which is subscribed to xserver-xorg-video-openchrome in Ubuntu.
https://bugs.launchpad.net/bugs/1087767

Title:
  Mode selection buggy on P4M900

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