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

[Michel Dänzer]

On 28.10.2015 19:45, Luis Henriques wrote:
> On Tue, Oct 27, 2015 at 11:10:29AM +0900, Michel Dänzer wrote:
>> 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.
> 
> Thanks, I'll drop this patch for this 3.16 release, and will wait for a
> fix to be available.

The regression is fixed in commits
4cee6a9057d5e13911f0cb6e143d11dc1a3245dd and
ae93580ee59c02395c1711d3e6b90546b8137b86 . Please only backport
4281f46ef839050d2ef60348f661eb463c21cc2e together with those two.


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