[Bug 78937] [BDW Regression]igt/gem_render_linear_blits fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78937

--- Comment #11 from Guo Jinxian <jinxianx.guo at intel.com> ---
Created attachment 100138
  --> https://bugs.freedesktop.org/attachment.cgi?id=100138&action=edit
dmesg

(In reply to comment #6)
> Ok, then please do the bisect as Chris requested.
I found the test unable exit on some commit during bisecting. and I found the
first bad commit of unable exit was 78325f2d270897c9ee0887125b7abb963eb8efea

commit 78325f2d270897c9ee0887125b7abb963eb8efea
Author:     Ben Widawsky <benjamin.widawsky at intel.com>
AuthorDate: Tue Apr 29 14:52:29 2014 -0700
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Mon May 5 10:56:53 2014 +0200

    drm/i915: Virtualize the ringbuffer signal func

    This abstraction again is in preparation for gen8. Gen8 will bring new
    semantics for doing this operation.

    While here, make the writes of MI_NOOPs explicit for non-existent rings.
    This should have been implicit before.

    NOTE: This is going to be removed in a few patches.

    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>


Output:
time ./gem_render_linear_blits                     
IGT-Version: 1.6-g532b7e6 (x86_64) (Linux:
3.15.0-rc3_drm-intel-next-queued_78325f_20140513+ x86_64)
not enough RAM to run test, reducing buffer count
Verifying initialisation...
Cyclic blits, forward...

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