i810 driver and X

[Takis Diakoumis <linux@executequery.org>]

Hi

i'm experiencing a problem when switching views from laptop lcd to
external display and back or with both.

i have an IBM ThinkPad R51 2887GVM running debian testing.

it uses the i855GM video chip and i'm using the i810 driver in X.
i have the relevant modules loaded in the kernel (custom debian kernel
2.6.11) - i830 and intel_agp.

when switching to external display the top of the screen is garbage and
the screen has moved down. when switching to both screens - both exhibit
the top 50 or so pixels as garbage and when switching back to laptop
screen only it stays as garbage. the only way i can retrieve that part
of the screen is to restart X.

i have posted a shot of both screens at:
for the external monitor - 
http://www.executequery.org/linuxthinkpad/thinkpad-monitor.jpg
for the laptop lcd - 
http://www.executequery.org/linuxthinkpad/thinkpad-screen.jpg

interestingly, using the vesa driver in X instead of i810 does not cause
this issue - it works as expected.

has anyone else experienced this with the xfree i810 driver?
is there a way i can fix this? a work around - other than "use the vesa
driver" ;) 

any suggestions would be appreciated.

thanks
Takis