https://bugs.freedesktop.org/show_bug.cgi?id=28073

--- Comment #4 from James Cloos <[email protected]> 2010-05-12 10:57:04 PDT ---
> Older radeons rarely had edids for the LVDS panel, the vbios lvds
> table only has the panel modeline, not the physical size.

The old radeon driver (back in the xfree86 days) did know that my
laptop’s screen was 12”×9”.  I originally added --dpi 133 to my X
startup scripts only because the integer conversions between inch
(for dpi) and mm (for dimensions) led to rounding errors.

To the Reporter:  you may need to add --dpi 124 to your startup
scripts to get accurate sizing with the current X server.

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