[Bug 76554] [gm45 regression] [drm:init_ring_common]: *ERROR* render ring initialization failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76554

--- Comment #35 from Chris Wilson <chris at chris-wilson.co.uk> ---
That's scary. The immediate read of RING_HEAD after it returned 0 during the
first initialisation returns a non-zero value... It only just barely passed the
self-checks during module load. Just as importantly, it did not have the
pattern I was expecting.

I think we should try emitting a dummy command and seeing if the CS ring
updates.

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