intel845 ugly gradients banding with i810 in 24bit mode - no dither?

[zamiere at gmail.com]

I have a problem, I sent report to bugzilla, but nobody answers for me.
The problem is with intel 845 integrated (in dell inspiron 1100), in 24  
bit mode gradients banding.
I found in nv driver a parameter, which enable some dithering with 24 bit  
mode and it's solve the banding problem.
A similar option exists in i810 module? In 16 bit mode, the dithering is  
enabled, and looks better than in 24 bit mode, but the 16bit mode  
obviousli not enough, when too little the difference between two side of  
gradients and it's looks like a little noisy. In windows, with original  
intel driver, in 32 bit mode (I know it's 24), everythings looks great.

I can't use linux without correct i810 driver for graphical works. :(

Any help would be appreciated.

z