i810 rotate memory range off?

[Josh Myer]

First off: thanks for getting i810 rotation working!  It's not quite 
working here, but the pieces are there and it just needs some massaging. 
  I'd appreciate any feedback or help in making it work here.

I'm using the i810 driver with Rotate: it almost works, but the memory 
range mappings seem to be off.  There's a region of random-ish noise on 
the far right of the screen, with a weird little band of noise at the 
bottom as well.  I took a picture of the display while running, 
available at:
   http://www.joshisanerd.com/i810_rotate_corruption.jpg

The logfile is at:
   http://www.joshisanerd.com/i810_rotate_corruption_log.txt

The reason I say the left-hand band is random-ish is that, if I switch 
ot the VESA driver, then switch back to the i810 driver, the desktop 
contents at shutdown of the old server appear over there.

Also, it's setting up a 1600x1200 virtual desktop.  The far right edge 
of this desktop doesn't quite match up with the memory mappings: I can 
shoot my cursor ~100pixels off the end, then pull it back in.  Whenever 
I move a window over there, its contents get pushed into a ~32pixel 
strip along the right edge, moving down the screen as I move to the right.

X.org is 6.8.2 from Debian, built 29nov05

This is in a Dell Inspiron 300m with the 852GM/855GM chipset.

Thanks again for all the work on this!
--
/jbm