https://bugzilla.kernel.org/show_bug.cgi?id=63101
--- Comment #11 from Alex Deucher alexdeucher@gmail.com --- (In reply to Kertesz Laszlo from comment #10)
This issue has to do with the radeon driver, because if i dont append radeon.dpm=1 to the kernel boot options, TF2 launches even with latest 3.12 rc5+ kernel (but it has dismal performance).
If it was dpm specific you should have mentioned that. Make sure your kernel has this patch: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=40...