Comment 83 for bug 118745

New driver is out but doesn't fix this issue.

Linux 2.6.23git, glibc 2.6.1, i686, Thinkpad Z60m with ATI Mobile X600,
xorg-xserver-server 1.4-3, xorg-driver-video-ati 6.7.193, Mesa 7.0.1.

By default driver calculates very wrong panel size:
  dimensions: 1680x1050 pixels (444x277 millimeters)
  resolution: 96x96 dots per inch

The correct one is DisplaySize 330 210 (mm).

I'm attaching my config, x log and xdpyinfo output.