Intel - Dithering on a 6 bit panel

[James Legg]

Hello,

I have an Asus X58L laptop, which has Intel GM965 graphics. The
framebuffer configurations reported by glxinfo all have 8 bits for each
of the colour channels. However, the output looks like 6 bits with
static 2 by 2 spatial dithering. Assuming the display is actually 6
bits, is there any way I can get temporal dithering?

Thank for your time,
James