https://bugs.freedesktop.org/show_bug.cgi?id=102372
--- Comment #14 from Alex Deucher alexdeucher@gmail.com --- (In reply to Lyude Paul from comment #13)
Poke: this should be reverted, as mentioned in IRC enabling DC has unfortunately broken the displays on this TONGA GPU as well. GPU info:
[AMD/ATI] Tonga PRO [Radeon R9 285/380] [1002:6939] (rev f1)
Tonga is a different generation of display hardware so is unrelated to this.