Thanks for attaching the Xorg.0.log. It looks like the EDID shows up properly in the X server startup, so not sure why the data isn't making it to xrandr.
One more thing - could you run `sudo ddcprobe > ddcprobe.txt` and `sudo get-edid > edid.dat` and attach both those files here? Thanks ahead of time. ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Confirmed => Incomplete -- [xpress] xrandr doesn't detect external monitor properly https://bugs.launchpad.net/bugs/247963 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs