Here is a fix for this issue. It turned out that in early versions of
EDID, 'aspect=0' was used to indicate a 1:1 aspect ratio, but in later
versions like 1.3 and 2.0, they redefined it to mean a 16:10 aspect
ratio. I guess ddcprobe was developed prior to this change, so was just
assuming 1:1 for all versions of EDID info, and thus resulted in this
bug.
The attached ddcprobe contains new logic, based on the xserver EDID
handling code, to account for this properly. In addition, while looking
at the code I saw that the 'aspect=3' case was simply incorrect; it is
using a 16:10 ratio there, whereas in the specification, and in xserver,
it clearly should be 16:9. I'm curious about this mistake, and why it
appears not to have caused issues for anyone, but I suppose it's just a
rare corner case, and probably hidden by other xresprobe bugs. Or maybe
it's been reported elsewhere, or has symptoms that aren't being
recognized as an xresprobe issue. In any case, I think coupled with the
above fix, this may open up additional resolutions for users of 16:9
ratio hardware.
** Changed in: xresprobe (Ubuntu)
Status: Confirmed => Fix Committed
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feisty fresh install sets xorg.conf to 1440x1440 instead of 1440x900 nvidia
https://bugs.launchpad.net/bugs/115220
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