https://bugs.freedesktop.org/show_bug.cgi?id=91202
--- Comment #10 from Vedran Miletić rivanvx@gmail.com --- Further information: this bug does not occur on R9 380, tested with
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Tonga PRO [Radeon R9 285/380] [1002:6939] (rev f1) (prog-if 00 [VGA controller])
Dual DVI using DVI-I and DVI-D works fine.