Due to faulty assumptions made by commit 2072d9aa

, many RAGE 128 Pro
VGA display will be detected as DVI, and causes out of range display
error with the attached monitor. While this commit is less than
perfect and only works on x86 platform, it avoids causing out of
range display error. With this fix, there is no longer the need to
specify the supported frequency range of the monitor inside xorg.conf.
The code was tested on RAGE 128 Pro Ultra 16 MB AGP.

Signed-off-by: Kevin Brace <kevinbrace@gmx.com>