GDM/Gnome confused about screen size

[Alex Bennee]

Hi,

Since I finally got a working KMS build I have one final problem. GDM
gets confused about what the screen size actually is. Although there
is a display across the whole screen the menu bar and background image
take up the top 3/4 of the screen.

When Gnome starts it's menubars are both shorter and the bottom menu
bar doesn't sit at the bottom of the physical screen. Interestingly if
I drag the menu bar lower it actually expands it's width to fill the
screen. I'm wondering if this is due to having my second monitor
plugged in (but turned off) to the VGA port. xrandr reports:

09:07 alex at danny/x86_64 [linux-2.6-stable.git] >xrandr
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 4096 x 4096
VGA1 connected 1440x900+0+0 (normal left inverted right x axis y axis)
408mm x 255mm
   1440x900       59.9*+
   1280x1024      75.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        72.8     75.0     66.7     60.0
   720x400        70.1
DVI1 connected 1680x1050+0+0 (normal left inverted right x axis y
axis) 459mm x 296mm
   1680x1050      59.9*+
   1280x1024      75.0
   1152x864       75.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        72.8     75.0     66.7     60.0
   720x400        70.1

I'm willing to raise a bug but I'm not sure what it should be against.
Certainly both GDM and Gnome work fine when KMS is not enabled but is
it likely their bug or with the X side of things? How does Gnome
interrogate X to find out about these things? Any ideas?

-- 
Alex, homepage: http://www.bennee.com/~alex/
http://www.half-llama.co.uk