Upstream commit id in Linux 5.17-rc:
99510e1afb4863a225207146bd988064c5fd0629 ("drm/i915: Disable DSB usage
for now").
I'd like to nominate that patch for application to the 5.15-stable
tree. It applies trivially after dropping the ...
.has_pxp = 1, \
... line of context. That line of context was introduced by the
unrelated feature introduced later by
6f8e203897144e59de00ed910982af3d7c3e4a7f ("drm/i915/pxp: enable PXP
for integrated Gen12"), so can be safely dropped.
Disabling use of the DSB for GAMMA_LUT updates should fix corrupted
display colors on Intel Tigerlake, Rocketlake, DG-1 and Alderlake-S
Generation 12 graphics. Good explanation is in the upstream commit,
but for reference here the bug report which led to the bug diagnosis
and fix:
https://gitlab.freedesktop.org/drm/intel/-/issues/3916
This would make high color precision and HDR display modes usable on
Gen 12 graphics with Linux 5.51-stable.
Thanks for consideration,
-mario
