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<body><span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
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<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - lighting render issue with i965 on SKL+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103047">bug 103047</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>ASSIGNED
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<td style="text-align:right;">Assignee</td>
<td>intel-3d-bugs@lists.freedesktop.org
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<td>kenneth@whitecape.org
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - lighting render issue with i965 on SKL+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103047#c16">Comment # 16</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - lighting render issue with i965 on SKL+"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103047">bug 103047</a>
from <span class="vcard"><a class="email" href="mailto:kenneth@whitecape.org" title="Kenneth Graunke <kenneth@whitecape.org>"> <span class="fn">Kenneth Graunke</span></a>
</span></b>
<pre>Hi Steven,
It turns out that this is a known hardware issue with provoking vertices not
working right in some circumstances. The good news is that there's a simple
workaround. The bad news is that it's going to take a kernel patch to fix it.
:(
Patch from Chris Wilson and I:
<a href="https://lists.freedesktop.org/archives/intel-gfx/2018-June/168389.html">https://lists.freedesktop.org/archives/intel-gfx/2018-June/168389.html</a>
In the meantime, if you have intel-gpu-tools installed, you may be able to work
around the issue by running these commands:
$ sudo intel_reg write 0x2090 0x10001000
$ sudo intel_reg write 0x2088 0x20002
(That should fix the issue, but I'm not clear whether the values will stick or
if they'll get reset when the GPU goes into a low power state...)
Thank you for the report! And huge thanks to Danil for tracking this down to a
provoking vertex problem.</pre>
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