Patch "drm/amdgpu: Restore LCD backlight level on resume" has been added to the 4.2-stable tree

Patch "drm/amdgpu: Restore LCD backlight level on resume" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/amdgpu:  Restore LCD backlight level on resume

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-restore-lcd-backlight-level-on-resume.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 74b3112e95073b351e3b0b9799795bc76f8415fa Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 29 Sep 2015 13:53:30 -0400
Subject: drm/amdgpu:  Restore LCD backlight level on resume

From: Alex Deucher <alexander.deucher@amd.com>

commit 74b3112e95073b351e3b0b9799795bc76f8415fa 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.

Port of radeon commit:
drm/radeon: Restore LCD backlight level on resume (>= R5xx)

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/atombios_encoders.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c
@@ -1279,8 +1279,7 @@ amdgpu_atombios_encoder_setup_dig(struct
 			amdgpu_atombios_encoder_setup_dig_encoder(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON, 0);
 		}
 		if (amdgpu_encoder->devices & (ATOM_DEVICE_LCD_SUPPORT))
-			amdgpu_atombios_encoder_setup_dig_transmitter(encoder,
-							       ATOM_TRANSMITTER_ACTION_LCD_BLON, 0, 0);
+			amdgpu_atombios_encoder_set_backlight_level(amdgpu_encoder, dig->backlight_level);
 		if (ext_encoder)
 			amdgpu_atombios_encoder_setup_external_encoder(encoder, ext_encoder, ATOM_ENABLE);
 	} else {


Patches currently in stable-queue which might be from alexander.deucher@amd.com are

queue-4.2/drm-amdgpu-restore-lcd-backlight-level-on-resume.patch
queue-4.2/drm-amdgpu-fix-max_vblank_count-value-for-current-display-engines.patch