I have a similar problem, although it does not seem to be related to the video card.
The setup is a MacBook 8,1 running Ubuntu 11.04 connected to a 27" iMac via a crosslink Mini DisplayPort cable. The iMac mirrors output when the GRUB screen is reached, but then remains black for the rest of the session. When starting Ubuntu in Unity mode with effects enabled, the MacBook fails to update the screen once the iMac is connected. It either goes black or freezes, with the cursor still intact. The iMac remains dark. When starting Ubuntu in classic mode without effects, the MacBook screen works as usual without freezing. When the display port is plugged in, the display goes blank for a second, but then returns properly. Yet, the iMac remains dark. Still, the iMac is properly recognized. Via the "Monitors" configuration dialog, I can set its proper resolution and arrange it, yet it doesn't react. The video card is an Intel one - I can't get the exact model right now, but the responsible kernel module is called "i915". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/597070 Title: Imac Radeon HD 4850 switch "Mini Display Port" output during install resulting black screen -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
