I'm seeing similar symptoms with a clean Karmic install on a Dell Latitude D420. Connect up a second screen, go to system/preferences/display and the display hangs with a black screen. The graphics controller is as follows;
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) -- [i945gm] [karmic] X servers hangs when settings up dual monitor config https://bugs.launchpad.net/bugs/438000 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs -- universe-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/universe-bugs
