Some Sony notebook computers have a controller that handles various built-in devices. The
sony driver provides support for accessing/modifying the settings of some of these devices via the
sysctl(8) interface.
The following
sysctl(8) variables are available:
hw.sony0.brt [R/W]
Controls current LCD brightness. Range [0-8].
hw.sony0.pbr [R/W]
Controls power on LCD brightness. Range [0-8].
hw.sony0.cdp [R/W]
Controls CD power.
hw.sony0.pid [R/O]
Unknown
hw.sony0.ctr [R/W]
Unknown
hw.sony0.pcr [R/W]
Unknown
hw.sony0.cmi [R/W]
Unknown
hw.sony0.ams [R/W]
Audio control (mute when 0)
hw.sony0.hke [R/O]
Indicates a Host Key Event. Bits are set when an event occurs and cleared when this value is read. The following table describes the bit set for each button pressed:
0x0200
Fn + F10 (magnify)
0x0020
Fn + F12 (suspend to disk)
0x0010
Fn + F7 (LCD/external monitor)
0x0008
Fn + F6 (brighter backlight)
0x0004
Fn + F5 (darker backlight)
0x0002
Fn + F4 (volume up)
0x0001
Fn + F3 (volume down)