[Bug 103047] lighting render issue with i965 on SKL+

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103047

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|intel-3d-bugs at lists.freedes |kenneth at whitecape.org
                   |ktop.org                    |

--- Comment #16 from Kenneth Graunke <kenneth at whitecape.org> ---
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:
https://lists.freedesktop.org/archives/intel-gfx/2018-June/168389.html

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.

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