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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #106 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 95468892fdfeef6d1004b524e35957629efdbe00
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Thu Aug 7 15:39:54 2014 +0100

    drm/i915: Reset the HEAD pointer for the ring after writing START

    Ville found an old w/a documented for g4x that suggested that we need to
    reset the HEAD after writing START. This is a useful fixup for some of
    the g4x ring initialisation woes, but as usual, not all.

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