Created attachment 125486 [details] Xorg.0.log Latest git of the xserver & driver crashes on start, log with debug=full attached. Dunno if it's actually due to the driver. Recompiling it after reverting to xserver 1.18.4 has it start fine. Second attachment is unrelated, just the various compile warnings by gcc6.
Created attachment 125487 [details] gcc6 compile log
Relevant breaking commit is b4e46c0: xfree86: Hook up colormaps and RandR 1.2 gamma code v6
Fixed; guess that one did it. *** This bug has been marked as a duplicate of bug 97124 ***
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