Created attachment 23597 [details] The X server log Notice the "(II) RADEON(0): clock: 108.0 MHz Image Size: 48 x 228 mm" line in the attatched log.
That's not miscalculated, that's what the EDID block actually reports. That we don't correct for it is a bug though.
Mass closure: This bug has been untouched for more than six years, and is not obviously still valid. Please file a new report if you continue to experience issues with a current server.
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