[Bug 247416] x11-servers/xorg-server: DRI2 fails on AMD Polaris 10

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247416

--- Comment #10 from Jan Beich <jbeich at FreeBSD.org> ---
(In reply to Adam Jimerson from comment #9)
> [drm:gfx_v8_0_ring_test_ring] amdgpu: ring 0 test failed (scratch(0xC040)=0xCAFEDEAD)
> [drm:amdgpu_device_ip_init] hw_init of IP block <gfx_v8_0> failed -22
> drmn0: amdgpu_device_ip_init failed

No clue how important this is. Try cold reboot: power off, wait half a minute
for remaining power to dissipate, then turn on. Try loading amdgpu manually
instead of via kld_list.

> drmn0: Fatal error during GPU init
> [drm] amdgpu: finishing device.
> device_attach: drmn0 attach returned 22

Probably explains broken /dev/dri/card0 i.e., DRM has initialized but cannot do
anything because device-specific driver failed.

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