https://bugs.freedesktop.org/show_bug.cgi?id=83616
--- Comment #12 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #11)
Sorry Alex, but is this intended (it is in the logs since 3.16+, too)?
[ 11.316570] radeon 0000:01:00.0: (-1) pin WB bo failed [ 11.316582] radeon 0000:01:00.0: f2fb0c00 unpin not necessary [ 11.316601] radeon 0000:01:00.0: disabling GPU acceleration [ 11.369220] radeon 0000:01:00.0: f6064000 unpin not necessary
[ 11.433188] [TTM] Finalizing pool allocator [ 11.433309] [TTM] Zone kernel: Used memory at exit: 0 kiB [ 11.433317] [TTM] Zone highmem: Used memory at exit: 0 kiB [ 11.433320] [drm] radeon: ttm finalized
[ 11.433325] [drm] Forcing AGP to PCIE mode
So, maybe GTT/GART grows to big?
AGP should work. You'll have to bisect. Anyway, this is not related to this bug. Please open a new one.