<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c17">Comment # 17</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 <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>commit b77422f80337d363eed60c8c48db9cb6e33085c9 Author: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>> Date: Fri Jun 15 20:06:05 2018 +0100 drm/i915: Enable provoking vertex fix on Gen9 systems. The SF and clipper units mishandle the provoking vertex in some cases, which can cause misrendering with shaders that use flat shaded inputs. There are chicken bits in 3D_CHICKEN3 (for SF) and FF_SLICE_CHICKEN (for the clipper) that work around the issue. These registers are unfortunately not part of the logical context (even the power context), and so we must reload them every time we start executing in a context. Bugzilla: <a href="https://bugs.freedesktop.org/103047">https://bugs.freedesktop.org/103047</a> Signed-off-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>> Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Link: <a href="https://patchwork.freedesktop.org/patch/msgid/20180615190605.16238-1-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20180615190605.16238-1-chris@chris-wilson.co.uk</a> Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>> Cc: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a> will land first in v4.19 / v4.18 and we'll backport as far as people ask.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>