Laptop with external display running X11.

[peasthope@shaw.ca]

Squeeze is installed on an IBM ThinkPad A22m and X11 has worked 
with no obvious problems.

Yesterday I connected a PanaSync E70i monitor to the VGA connector 
and set BIOS Display to "external".  All appeared normal until Xdm 
started.  There display reverted to the built-in flat screen with 
the broken image visible here.
  http://members.shaw.ca/peasthope/ThinkPadDisplay.jpg
  
After rebooting, xdm gives only a black screen.  Even after purging 
and reinstalling xdm, xserver-org and xserver-common, xdm gives a 
black screen.  The tails of /var/log/Xorg.0.log and xdm.log are 
appended.  There is no /etc/X11/xorg.conf.  

Similarities between this problem and my attempts to drive a TV 
with the composite video signal from a Compaq Armada are noticeable.

My error messages are similar to those reported here.
http://lists.debian.org/debian-user/2011/03/msg00810.html

From, http://lists.debian.org/debian-user/2011/04/msg00165.html
> You should know the drill ...

Yes, for a monitor connected to a desktop machine.  Someone please 
tell me where to find the drill for a monitor on a laptop.

Appears that the automation of modern X fails with an external 
display on a laptop. 
* Any idea of where X stores the broken configuration?
* Can X be made to work on the built-in screen again without 
  reinstalling the system?
* Does anyone have an external display working on a laptop with a 
  contemporary Debian?  Any tips or recipe?
  
Thanks,                ... Peter E.

root@whiterock:/var/log# tail Xorg.0.log
(EE) R128(0): R128CCEWaitForIdle: CCE stop -9
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
(EE) R128(0): R128CCEWaitForIdle: CCE idle -9
(EE) R128(0): Idle timed out, resetting engine...
(EE) R128(0): R128CCEWaitForIdle: CCE stop -9
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
(EE) R128(0): R128CCEWaitForIdle: CCE idle -9
(EE) R128(0): Idle timed out, resetting engine...
(EE) R128(0): R128CCEWaitForIdle: CCE stop -9
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
root@whiterock:/var/log# tail xdm.log
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
(EE) R128(0): R128CCEWaitForIdle: CCE idle -9
(EE) R128(0): Idle timed out, resetting engine...
(EE) R128(0): R128CCEWaitForIdle: CCE stop -9
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
(EE) R128(0): R128CCEWaitForIdle: CCE idle -9
(EE) R128(0): Idle timed out, resetting engine...
(EE) R128(0): R128CCEWaitForIdle: CCE stop -9
(EE) R128(0): R128CCEWaitForIdle: CCE start -9
(EE) R128(0): R128CCEWaitForIdle: CCE idle -9
root@whiterock:/var/log# ls /etc/X11/xorg.conf
ls: cannot access /etc/X11/xorg.conf: No such file or directory



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