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". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/659205 Title: [fglrx] fails to detect correct resolution with non-multiple of 64 virtual desktop area -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
