Can you please replace your /lib/modules/2.6.38-8-generic/kernel/drivers/gpu/drm/radeon/radeon.ko with the attached one (take a backup of the original). The difference is that it will print out a message when the GART is initialized. Please attach the dmesg output after booting with it.
** Attachment added: "radeon.ko for 2.6.38-8" https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/755715/+attachment/2037788/+files/radeon.ko -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/755715 Title: [RV670] radeon 3870 X2 gives black screen if using extended desktop -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
