[PATCH 3.16.y-ckt 072/104] drm/radeon: Restore LCD backlight level on resume (>= R5xx)

[Michel Dänzer]

On 26.10.2015 22:42, Luis Henriques wrote:
> 3.16.7-ckt19 -stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: =TF-8?q?Michel Dänzer?= <michel.daenzer at amd.com>
> 
> commit 4281f46ef839050d2ef60348f661eb463c21cc2e upstream.
> 
> Instead of only enabling the backlight (which seems to set it to max
> brightness), just re-set the current backlight level, which also takes
> care of enabling the backlight if necessary.
> 
> Only the radeon_atom_encoder_dpms_dig part tested on a Kaveri laptop,
> the radeon_atom_encoder_dpms_avivo part is only compile tested.
> 
> Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Luis Henriques <luis.henriques at canonical.com>

We're currently investigating a regression which was bisected to this
change. Please hold off on backporting this change until we have a
solution for that.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer