What:		/sys/class/backlight/<backlight>/als_channel
Date:		May 2012
KernelVersion:	3.5
Contact:	Johan Hovold <jhovold@gmail.com>
Description:
		Get the ALS output channel used as input in
		ALS-current-control mode (0, 1), where:

		==  ==========================
		0   out_current0 (backlight 0)
		1   out_current1 (backlight 1)
		==  ==========================

What:		/sys/class/backlight/<backlight>/als_en
Date:		May 2012
KernelVersion:	3.5
Contact:	Johan Hovold <jhovold@gmail.com>
Description:
		Enable ALS-current-control mode (0, 1).

What:		/sys/class/backlight/<backlight>/id
Date:		April 2012
KernelVersion:	3.5
Contact:	Johan Hovold <jhovold@gmail.com>
Description:
		Get the id of this backlight (0, 1).

What:		/sys/class/backlight/<backlight>/linear
Date:		April 2012
KernelVersion:	3.5
Contact:	Johan Hovold <jhovold@gmail.com>
Description:
		Set the brightness-mapping mode (0, 1), where:

		==  ================
		0   exponential mode
		1   linear mode
		==  ================

What:		/sys/class/backlight/<backlight>/pwm
Date:		April 2012
KernelVersion:	3.5
Contact:	Johan Hovold <jhovold@gmail.com>
Description:
		Set the PWM-input control mask (5 bits), where:

		=====   ===========================
		bit 5   PWM-input enabled in Zone 4
		bit 4   PWM-input enabled in Zone 3
		bit 3   PWM-input enabled in Zone 2
		bit 2   PWM-input enabled in Zone 1
		bit 1   PWM-input enabled in Zone 0
		bit 0   PWM-input enabled
		=====   ===========================