(In reply to Oded Gabbay from comment #4)
> Did you try running a 4.5 kernel ?
> I added a POWER relevant fix for radeon in 4.5, which relates to caches
> (c524498 -  drm/radeon: mask out WC from BO on unsupported arches)

Hi, Oded

I compiled 4.6-rc6 today and the result is the same (actually, now that I see,
the second dmesg I attached is from 4.6-rc4). The card works on the x8 slot
(behind the DART) but not on the x16 slot (bypassing the DART).

Thanks,

Rui