I am having the same problem, but it is when trying to disable mirrored displays (as explained in the description of the bug), not when enabling it (as the title says).
I have a Dell Latitude D420 with an Intel Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller and I am running a fresh install of Ubuntu 9.10 (Karmic Koala) with updates. When I boot with an external monitor I get a bad resolution because by default the screens are mirrored, even when the lid of the notebook is closed. When I untick Mirror screens and increase the resolution, the screens gets black with only the cursor visible, but it doesn't move. I have to do a hard reset. The error is repeatable, even on the live cd. But it is strange that on my previous instalation of Ubuntu 9.10 on the same computer I did not experience this bug. It could be some update that broke it, but as I said, I get the same error from the live cd (with no updates). Unfortunately, I was not able to gather much information. Running gnome-display-properties from the console and redirecting the output I only get (from the standard error): (gnome-display-properties:2149): Gtk-WARNING **: Ignoring the separator setting (gnome-display-properties:2149): Gtk-WARNING **: No object called: I have enabled apport, but there is no apport.log in /var/log/ and /var/crash is empty. As suggested, I installed policykit-gnome and its dependencies, even when policykit-1-gnome was already installed, but it did not fix the problem for me. Eventually I found a workaround: untick Mirror screens, select the monitor of the notebook and switch the radio buttom to off. -- Attempting to enable mirrored displays on a fresh Ubuntu install fails when not root - missing dependency https://bugs.launchpad.net/bugs/454261 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
