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It's not obvious that when using the new color manager stuff you still need to wire up the legacy helper to get legacy LUT support. Improve this with more links. drm_crtc_funcs->gamma_set already explains this properly. Cc: Peter Rosin <peda@axentia.se> Cc: Boris Brezillon <boris.brezillon@free-electrons.com> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170620094228.4757-1-daniel.vetter@ffwll.ch