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[Phil M <659205@xxxxxxxxxxxxxxxxxx>]

I'm seeing similar behavior on a desktop with a Radeon HD 4870. However,
the 'multiples of 64' bit seems to be a red herring.

I have a pair of 1920x1080 displays, and when I set "Virtual 3840 1080",
the maximum detected resolutions are 1440x900 and 1400x1050. If I set
"Virtual 3840 1088" (multiple of 64), I get the same result. If I set
"Virtual 3840 3840", both displays offer the intended 1920x1080 mode.

In the failure case, I see these lines in /var/log/Xorg.0.log:

(II) fglrx(0): Not using mode "1920x1080" (width too large for virtual size)
(II) fglrx(0): Not using mode "1776x1000" (width too large for virtual size)
(II) fglrx(0): Not using mode "1680x1050" (width too large for virtual size)

Is it possible the driver wants a virtual area big enough to contain the
modes in any orientation and arrangement? I'll go see what happens if I
set "Virtual 3840 1920".

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https://bugs.launchpad.net/bugs/659205

Title:
  [fglrx] fails to detect correct resolution with non-multiple of 64 virtual desktop area