ATI 9100 IGP no true color

[Xiaotian Sun]

Hi,

I've been trying to get my ATI 9100 IGP to display in true color (24
bit depth).  Xorg.0.log says it's in 24-bit depth.  But from the
displayed image it can be clearly seen it's not in 24-bit depth.

I've tried both the radeon driver and the ATI fglrx driver.  I've also
tried D-Sub and DVI.  All the same.

My monitor is Dell 2001FP in 1600x1200 mode.

Anyone know how to fix the problem?

Thanks,

Xiaotian