OK weird. After lots of playing around/rebooting/messing with mode lines in xorg.conf/etc. I solved it.
I solved it by bringing down X (sudo /etc/init.d/gdm stop), then TURNING OFF the monitor's power, then turning on the monitor,then starting X again. After I did that, xrandr was able to see my monitor: Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 1920 x 1200 default connected 1920x1200+0+0 0mm x 0mm 1920x1200 60.0* ... and the X server was able to use EDID to learn about it: (II) fglrx(0): Connected Display1: CRT on primary DAC [crt1] (II) fglrx(0): Display1 EDID data --------------------------- (II) fglrx(0): Manufacturer: PTS Model: 961 Serial#: 16843009 (II) fglrx(0): Year: 2007 Week: 30 (II) fglrx(0): EDID Version: 1.3 (II) fglrx(0): Analog Display Input, Input Voltage Level: 0.700/0.300 V (II) fglrx(0): Sync: Separate (II) fglrx(0): Max H-Image Size [cm]: horiz.: 52 vert.: 32 (II) fglrx(0): Gamma: 2.20 (II) fglrx(0): DPMS capabilities: StandBy Suspend Off; RGB/Color Display ... I'm not sure if there's any bug that can be fixed here; this is not the world's most high quality monitor. I wonder if it was just a hardware glitch that kept it from responding properly to EDID requests even after reboots etc.? -- [Hardy] After upgrade today can't detect screen size https://bugs.launchpad.net/bugs/214165 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