For now see VPro wiki topic.
V6/V8 Pixel Clock Issues
- Modes in the 109-193MHz range cannot be selected at all on V6/V8.
- Modes that are close to the lower end of that range (like 1280x1024_59/60) are only allowed at 8 bytes/pixel framebuffer size and even at that setting some people reported display problems (noise, flickering).
This limits the ability of the V6 and V8 to use a number of common display resolutions, a situation that can be at least partially over come with the use of reduced blanking. As an example, a CVT-generated [email protected] modeline without reduced blanking would have a Pixel Clock of 118.25MHz, which falls in the unusable 109-193MHz Pixel Clock range, while a modeline with reduced blanking would have a Pixel Clock of only 97.75MHz, which could be used by V6 or V8 graphics boards.