[Bug 111583] 30 bit colors causing banding with default settings

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111583

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Chris Wilson from comment #4)
> -modesetting, so let's presume this is due to the gamma curve processing in
> the kernel. Probably worth filing a bug over at gitlab for the modesetting
> ddx as well, e.g. it is probably sensible to use the highest precision gamma
> tables regardless of frontbuffer depth.

The approach I took with the intel ddx was stick with the legacy 8bpc LUT for
<=8bpc screen. The benefit being that we know it's not an interpolated gamma
mode and so directcolor type of stuff keeps working. The higher precision gamma
mode we expose may or may not be interpolated depending on the platform.

Shouldn't be too difficult for someone to port over the intel ddx gamma code to
the modesetting ddx.

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