> (II) RADEON(0): Monitor0: Using default hsync range of 28.00-33.00 kHz
> (II) RADEON(0): Monitor0: Using default vrefresh range of 43.00-72.00 Hz
>
> However, the monitor, DiamondPoint SB70 states in the manufacturers docs:
>
> Sync range:
>
> Horizontal      30 - 70 khz
> Vertical        50 - 120 khz
>
> Xorg claims that hsync for 1280x1024 (and a lot of others) is out of
> range. XFree86 on NetBSD/amd64 3.0 claimed the same thing.

I assume Vertical sync range is actually 50-120 Hz, not KHz.

Have you tried adding something like

Section "Monitor"
        Identifier   "Monitor1"
        VendorName   "DiamondPoint"
        ModelName    "SB70"

        HorizSync       30-70
        VertRefresh     50-120

EndSection