[Bug 91601] [ivb] rcs flip hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91601

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE
            Summary|System hangs for ~20        |[ivb] rcs flip hang
                   |seconds, text becomes       |
                   |garbled                     |

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
That kernel is missing a bug fix from circa v3.17 to force mmip flips on IVB
RCS.

commit 2a92d5bca1999b69c78f3c3e97b5484985b094b9
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Jul 8 10:40:29 2014 +0100

    drm/i915: Disable RCS flips on Ivybridge

    We currently see random GPU hangs when using RCS flips with multiple
    pipes on Ivybridge. Now that we have mmio flips, we can fairly cheaply
    fallback to using CPU driven flips instead.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77104
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

*** This bug has been marked as a duplicate of bug 77104 ***

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