On Sat, Feb 05, 2022 at 05:38:56AM +0100, Mario Kleiner wrote:
> 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.
Now queued up (also for 5.16.y)
thanks,
greg k-h
