slight bug with i810 driver (2)

Further informations about this bug :

I've found the guilty patch : 4.5.99.3-4.5.99.4.diff.bz2, which indeed has 
a big update of the i810.
But I have no clue how to correct it.

Some other points :

- removing the vga=0x317 kernel option makes the symptom different : no 
portion of XFree displays
on the console, but there are plenty of pixels which anyway make the 
console unusable. So the
frambuffer seems corrupted with or without the vga option.

- adding Option "ShadowFB" "yes" solves the problem, but of course XFree 
doesn't use hardware acceleration
in that case.

Hope this helps.

Loïc Mahé - Toulouse - France