vga=792 leads to black screen

[Thomas Cameron <thomas cameron camerontech com>]

I have added vga=792 to the kernel line in grub.conf for several years. 
 I've found that doing this with FC6 leads to a black screen, no little 
penguins at the top or anything.  I see the drive spin, and the system 
boots up fine, but the console is blank.

I've experienced it with 3 different NVidia and 1 ATI cards.

Anyone know why?

Thomas