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+What: /sys/devices/platform/samsung/performance_level
+Date: January 1, 2010
+KernelVersion: 2.6.33
+Contact: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Description: Some Samsung laptops have different "performance levels"
+ that can be modified by a function key, and by this
+ sysfs file. These values don't always make a whole lot
+ of sense, but some users like to modify them to keep
+ their fans quiet at all costs. Reading from this file
+ will show the current performance level. Writing to the
+ file can change this value.
+
+ Valid options:
+ - "silent"
+ - "normal"
+ - "overclock"
+
+ Note that not all laptops support all of these options.
+ Specifically, not all support the "overclock" option,
+ and it's still unknown if this value even changes
+ anything, other than making the user feel a bit better.
+
+What: /sys/devices/platform/samsung/battery_life_extender
+Date: December 1, 2011
+KernelVersion: 3.3
+Contact: Corentin Chary <corentin.chary@gmail.com>
+Description: Max battery charge level can be modified, battery cycle
+ life can be extended by reducing the max battery charge
+ level.
+
+ - 0 means normal battery mode (100% charge)
+ - 1 means battery life extender mode (80% charge)
+
+What: /sys/devices/platform/samsung/usb_charge
+Date: December 1, 2011
+KernelVersion: 3.3
+Contact: Corentin Chary <corentin.chary@gmail.com>
+Description: Use your USB ports to charge devices, even
+ when your laptop is powered off.
+ 1 means enabled, 0 means disabled.
+
+What: /sys/devices/platform/samsung/lid_handling
+Date: December 11, 2014
+KernelVersion: 3.19
+Contact: Julijonas Kikutis <julijonas.kikutis@gmail.com>
+Description: Some Samsung laptops handle lid closing quicker and
+ only handle lid opening with this mode enabled.
+ 1 means enabled, 0 means disabled.