change gamma with i810 driver?

[Yves Grenier <grenier.yves@wanadoo.fr>]

Hello,

Has anyone already succeded in changing monitor gamma (using xgamma, 
kgamma or any other mean) on a centrino laptop, chipset 855GM. I would 
like to know if it is possible, because I have been struggling with this 
for months.

Best wishes for the new year!

Yves Grenier

(I am using debian sarge, XFree86 4.3.0 and driver i810)