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    Bad riser

    The error look like this:

    
    [drm:amdgpu_ib_ring_tests] *ERROR* amdgpu: failed testing IB on
    ring 1 (-110).
    [drm:amdgpu_vce_ring_test_ib] *ERROR* amdgpu: IB test timed out.
    [drm:amdgpu_ib_ring_tests] *ERROR* amdgpu: failed testing IB on
    ring 2 (-110).
    [drm:amdgpu_vce_ring_test_ib] *ERROR* amdgpu: IB test timed out.
    [drm:amdgpu_ib_ring_tests] *ERROR* amdgpu: failed testing IB on
    ring 3 (-110).
    [drm:amdgpu_vce_ring_test_ib] *ERROR* amdgpu: IB test timed out.
    [drm:amdgpu_ib_ring_tests] *ERROR* amdgpu: failed testing IB on
    ring 4 (-110).
    [drm:amdgpu_vce_ring_test_ib] *ERROR* amdgpu: IB test timed out.
    
    riser image

    The reason is bad soldering or even broken line on riser. Third from the right on the image: riser image

    And another example: riser image

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