https://bugzilla.kernel.org/show_bug.cgi?id=82431
--- Comment #3 from Fede fedevx@yahoo.com --- Hi Alex,
In deed, adding radeon.dpm=1 works. I tested it after submitting the bug report since I went thru what the actual patch changed. Currently running kernel 3.16.0-5 and it works as long as radeon.dpm=1 is passed to the kernel.
GRUB_GFXPAYLOAD_LINUX=keep (nor text) did make any difference.
Can this be permanently fixed for everyone affected?