xorgcfg(1) fails to configure the Acer 1440x900 monitor
to work with X windows on 64-bit AMD OpenBSD 4.2.

According to xvidtune, the parameters for the Acer monitor are

Vendor: ACR, Model: Acer AL1916W
Num hsync: 1, Num vsync: 1
hsync range 0: 30.00 - 82.00
vsync range 0: 56.00 - 76.00
Video are not settable on this chip

Looks like the 7.2 Xorg ati driver may be broken.