xserver-xorg-video-i810 now only displays 640x480

[Alan Chandler]

I run Debian unstable on an Intel DG965SS motherboard with integrated 
965G graphics controller.

I have just restarted my computer after having been away for a few days 
and the display has come up in 640x480 mode and that seems to be the 
only option.  I have NOT changed xorg.conf so my guess is that a Debian 
upgrade to xserver-xorg-server-core which according to the changelog 
took place on 12th December and which probably propagated to my machine 
just before I shut it down on the 13th to go away is the root cause.

Look at the relevant part of xorg.conf 

Section "Device"
        Identifier      "Intel 965G"
        Driver          "i810"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Device          "Intel 965G"
        Monitor         "PLE430"
        DefaultDepth    24
        SubSection "Display"
                Depth           1
                
Modes           "1280x1024" "1152x864" "1024x768" "832x624" "800
x600" "720x400" "640x480"
        EndSubSection
... (different depths 4,8,15,16 in here, all the same otherwise)
        SubSection "Display"
		Depth           24
         Modes           "1280x1024" "1152x864" "1024x768" "832x624" "800
x600" "720x400" "640x480"
        EndSubSection
EndSection

(mail word wrap is screwing layout in above)

and looking at Xorg.0.log I get the following lines which I think 
explains that it cant find these modes.

(II) I810(0): PLE430: Using default hsync range of 28.00-33.00 kHz
(II) I810(0): PLE430: Using default vrefresh range of 43.00-72.00 Hz
(II) I810(0): Not using mode "1280x1024" (no mode of this name)
(II) I810(0): Not using mode "1152x864" (no mode of this name)
(II) I810(0): Not using mode "1024x768" (no mode of this name)
(II) I810(0): Not using mode "832x624" (no mode of this name)
(II) I810(0): Not using mode "800x600" (no mode of this name)
(II) I810(0): Not using mode "720x400" (no mode of this name)
(II) I810(0): Increasing the scanline pitch to allow tiling mode (640 -> 
1024).
(--) I810(0): Virtual size is 640x480 (pitch 1024)
(**) I810(0): *Built-in mode "640x480"
(II) I810(0): Attempting to use 60.00Hz refresh for mode "640x480" (850)
(==) I810(0): DPI set to (75, 75)

Can anyone point me in the right direction to identify if better why 
these modes are not being found and whether there is anything I could 
do to fix it.  Its a bit hard running the machine in 640 x 480 mode:-(

-- 
Alan Chandler
http://www.chandlerfamily.org.uk