I just got a new HD 6850 card. When I boot with it inserted, I get through bios and grub, and then have a few seconds of blinking cursor before the screen goes off and I can't get the machine to respond to anything. With the nomodeset option, I can boot to runlevel 3. Because everything freezes when the module is loaded with modesetting (and since the xorg driver seems to require it) that's as far as I can get. I'm running 64bit fedora 15 that is up-to-date as of today.
I''m building a test kernel for F15 with the voltage fixes from Alex in it http://koji.fedoraproject.org/koji/taskinfo?taskID=3154129 it will end up at http://kojipkgs.fedoraproject.org/scratch/airlied/task_3154129/ when it finishes building.
The voltage fixes make the card boot normally! Problem resolved.
Relevant patches: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a377e187df725fe7e62d2cec59ec290c5a605d93 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ee4017f4ac8163737793cc64df535cd246792887
*** Bug 38754 has been marked as a duplicate of this bug. ***
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