[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 #27 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #26)
> Created attachment 96783 [details]
> drm.debug=7 dmesg with patched kernel (cfa8aaa3)
> 
> With the branch that has cfa8aaa3 as a topmost commit, the ring
> initialization failures are still popping up on resume, but Xorg rendering
> turning into complete mess is finally solved, and the Xorg session is not
> corrupted and works! (althrough it feels like the whole things is slower,
> but that might be due to excessive logging going on).

Indeed. What happens is that UXA now finally detects that the kernel is
reporting that it cannot execute GPU commands, and instead it falls back to CPU
rendering directly into the framebuffer.

> dmesg with drm.debug=7 attached.
> 
> So if you are going to push anything of this upstream, please feel free to
> add my
> 
>    Reported-and-tested-by: Jiri Kosina <jkosina at suse.cz>
> 
> to it, although I assume the ring initialization failure still needs to be
> solved ... ?

Yes. We never knew why g45 failed in the first place, if we can figure out what
changed now, we may be able to create a better band-aid.

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