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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [skl rc6] GPU HANG"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94161#c12">Comment # 12</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [skl rc6] GPU HANG"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94161">bug 94161</a>
from <span class="vcard"><a class="email" href="mailto:mikael@djurfeldt.com" title="Mikael Djurfeldt <mikael@djurfeldt.com>"> <span class="fn">Mikael Djurfeldt</span></a>
</span></b>
<pre>I tested this both with Linus rc4 and drm-intel-nightly from today (rc7).
In both cases I still experience a GPU hang with the single (apart from
noresume) kernel cmd line option intel_iommu=igfx_off.
For rc4, I saw a new error code, though:
Mar 10 14:27:46 hat kernel: [ 56.843611] [drm] GPU HANG: ecode
9:0:0x87f99ff9, in gnome-shell [1742], reason: Ring hung, action: reset
I attach the corresponding crash dump file.
This means that the only way, so far, to avoid hangs is i915.enable_rc6=0.
I have confirmed that this is also true for rc7 (drm-intel-nightly).
On Thu, Mar 10, 2016 at 2:13 PM, <<a href="mailto:bugzilla-daemon@freedesktop.org">bugzilla-daemon@freedesktop.org</a>> wrote:
<span class="quote">> *<a href="show_bug.cgi?id=94161#c11">Comment # 11</a> <<a class="bz_bug_link
bz_status_NEW "
title="NEW - [skl rc6] GPU HANG"
href="show_bug.cgi?id=94161#c11">https://bugs.freedesktop.org/show_bug.cgi?id=94161#c11</a>> on
> <a class="bz_bug_link
bz_status_NEW "
title="NEW - [skl rc6] GPU HANG"
href="show_bug.cgi?id=94161">bug 94161</a> <<a class="bz_bug_link
bz_status_NEW "
title="NEW - [skl rc6] GPU HANG"
href="show_bug.cgi?id=94161">https://bugs.freedesktop.org/show_bug.cgi?id=94161</a>> from
> <a href="mailto:oddrunesl@gmail.com">oddrunesl@gmail.com</a> <<a href="mailto:oddrunesl@gmail.com">oddrunesl@gmail.com</a>> *</span >
>
<span class="quote">> adding intel_iommu=igfx_off and removing rc6=0 frpm kernel boot parameters of
> 4.5-rc4 reintroduces hang problems.</span >
>
<span class="quote">> ------------------------------
> You are receiving this mail because:</span >
>
<span class="quote">> - You reported the bug.
> - You are on the CC list for the bug.</span >
>
></pre>
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