[Intel-gfx] [PATCH 4/4] drm/i915: switch off backlight for backlight class 0 brightness

[Clint Taylor]

On 08/12/2014 07:11 AM, Jani Nikula wrote:
> Make backlight class sysfs brightness 0 value switch off the backlight
> for connectors that have the backlight_power callback defined. For eDP,
> this has the similar caveats regarding power savings as bl_power as only
> the power sequencer backlight control is switched off.
>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_panel.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index c365f2a57c75..574690afadb3 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -986,7 +986,8 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
>   	 */
>   	if (panel->backlight.enabled) {
>   		if (panel->backlight_power) {
> -			bool enable = bd->props.power == FB_BLANK_UNBLANK;
> +			bool enable = bd->props.power == FB_BLANK_UNBLANK &&
> +				bd->props.brightness != 0;
>   			panel->backlight_power(connector, enable);
>   		}
>   	} else {
>
Didn't get a chance to test this on nightly.

Reviewed_by: Clinton Taylor <Clinton.A.Taylor at intel.com>