Created attachment 59361 [details] Xorg log This happens on newest Ubuntu (precise beta): login manager shows fine (on one screen, other has signal out of range, but that is normal), but trying to set the two screens side by side freezes X. These work: xrandr --newmode 2560x1600 268.00 2560 2608 2640 2720 1600 1603 1609 1646 +hsync -vsync xrandr --addmode DisplayPort-0 2560x1600 xrandr --newmode "1280x800"x59.9 71.00 1280 1328 1360 1440 800 803 809 823 +hsync -vsync xrandr --addmode DisplayPort-0 "1280x800"x59.9 xrandr --output DisplayPort-0 --mode 2560x1600 But this fails: xrandr --output DisplayPort-0 --left-of DVI-0 $ uname -a Linux shirio 3.3.0-030300rc3-generic #201202082335 SMP Thu Feb 9 04:36:53 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux xorg 1:7.6+12ubuntu1, radeon driver 1:6.14.99~git20111219.aacbd629-0ubuntu2 Xorg.log attached
*** This bug has been marked as a duplicate of bug 47281 ***
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