https://bugs.freedesktop.org/show_bug.cgi?id=82588
--- Comment #8 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #6)
With linux-3.16.1 it works. lspci: 01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RS740 [Radeon 2100]
I don't think this is related to the original report since it's a different chip, but it would be nice if both you and Mike could bisect.