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