[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 #83 from Jiri Kosina <jikos at jikos.cz> ---
Created attachment 104224
  --> https://bugs.freedesktop.org/attachment.cgi?id=104224&action=edit
[PATCH] drm/i915: read HEAD register back in init_ring_common() to enforce
ordering

Ok, this is the minimal change that reliably makes my system behave properly
again finally (woohoo!).

Chris, Daniel, what do you think?

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