(In the heat of debugging bug #12245) I tried to use displayconfig-gtk to enable dual-head (laptop with X700 card + external LCD) and "Test" would always fail. Restarting X with the new xorg.conf crashes the server. xorg-server 2:1.3.0.0.dfsg-12ubuntu4 xserver-xorg-video-ati 6.7.192-1ubuntu1 Backtrace: 0: /usr/X11R6/bin/X(xf86SigHandler+0x81) [0x80c9781] 1: [0xffffe420] 2: /usr/X11R6/bin/X(xf86RandR12SetRotations+0x6b) [0x80fe41b] 3: /usr/X11R6/bin/X(xf86CrtcScreenInit+0x9e) [0x80fa59e] 4: /usr/lib/xorg/modules/drivers//radeon_drv.so(RADEONScreenInit+0x180f) [0xb7bdbb3f] 5: /usr/X11R6/bin/X(AddScreen+0x1ee) [0x807656e] 6: /usr/X11R6/bin/X(InitOutput+0x21e) [0x80a868e] 7: /usr/X11R6/bin/X(main+0x27b) [0x8076d0b]
Created attachment 11441 [details] xorg.conf for dual-head (made by displayconfig-gtk)
Created attachment 11442 [details] Xorg.0.log with backtrace
Seems to be confirmed with the same backtrace on ATI Radeon 7500 QW (AGP/PCI) in https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/132716/comments/31
The problem is you are trying to set up zaphod mode with a driver that doesn't support it. displayconfig-gtk is doing the wrong thing; use xrandr to configure 6.7.192.
I think this bug has run out of date. I have no displayconfig-gtk any longer either.
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