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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW Regression]igt/gem_ring_sync_copy fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78890#c4">Comment # 4</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [BDW Regression]igt/gem_ring_sync_copy fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78890">bug 78890</a>
from <span class="vcard"><a class="email" href="mailto:jinxianx.guo@intel.com" title="Guo Jinxian <jinxianx.guo@intel.com>"> <span class="fn">Guo Jinxian</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=100128" name="attach_100128" title="dmesg">attachment 100128</a> <a href="attachment.cgi?id=100128&action=edit" title="dmesg">[details]</a></span>
dmesg
(In reply to <a href="show_bug.cgi?id=78890#c3">comment #3</a>)
<span class="quote">> Just to confirm does disabling rc6 from the kernel commandline make the
> problem go away?</span >
Add parameter "i915.i915_enable_rc6=0" in kernel commandline and run this test,
the result was passed.
Output:
./gem_ring_sync_copy
IGT-Version: 1.6-g532b7e6 (x86_64) (Linux:
3.15.0-rc7_drm-intel-nightly_d13557_20140529+ x86_64)
Subtest sync-render-blitter-write-read: SUCCESS
Subtest sync-render-blitter-read-write: SUCCESS
Subtest sync-render-blitter-write-write: SUCCESS
Subtest sync-blitter-render-write-read: SUCCESS
Subtest sync-blitter-render-read-write: SUCCESS
Subtest sync-blitter-render-write-write: SUCCESS</pre>
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