[Bug 100964] RX-480 [drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 0 test failed (scratch(0xC040)=0xCAFEDEAD)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100964

--- Comment #8 from Maxim Cournoyer <maxim.cournoyer at gmail.com> ---
I managed to make it work by compiling latest 4.13.0-rc2+ from there:
git://people.freedesktop.org/~agd5f/linux. I used the 'drm-next-4.14-wip'
branch, and customized it a bit (added CIK option for amdgpu driver, removed
AGP support, bumped event rate to 1000 Hz, dropped a few Intel specific options
(I'm using AMD K10 class CPU) and enabled a few AMD specific options. I'll try
to narrow down exactly what fixes it, but one thing we can see is that there is
no longer clock source skew problems apparent in the kernel messages.

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