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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression] [bisected] i915 GPU HANG: ecode 7:1:0xfffffffe on Kernel 5.1.x and 5.2rc1 to 5.2rc6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111014#c18">Comment # 18</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [regression] [bisected] i915 GPU HANG: ecode 7:1:0xfffffffe on Kernel 5.1.x and 5.2rc1 to 5.2rc6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111014">bug 111014</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>See commit 928f8f42310f244501a7c70daac82c196112c190
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Apr 19 12:17:47 2019 +0100
drm/i915/ringbuffer: EMIT_INVALIDATE *before* switch context
Despite what I think the prm recommends, commit f2253bd9859b
("drm/i915/ringbuffer: EMIT_INVALIDATE after switch context") turned out
to be a huge mistake when enabling Ironlake contexts as the GPU would
hang on either a MI_FLUSH or PIPE_CONTROL immediately following the
MI_SET_CONTEXT of an active mesa context (more vanilla contexts, e.g.
simple rendercopies with igt, do not suffer).</pre>
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