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1What: /sys/devices/platform/samsung/performance_level2Date: January 1, 20103KernelVersion: 2.6.334Contact: Greg Kroah-Hartman <gregkh@linuxfoundation.org>5Description: Some Samsung laptops have different "performance levels"6 that can be modified by a function key, and by this7 sysfs file. These values don't always make a whole lot8 of sense, but some users like to modify them to keep9 their fans quiet at all costs. Reading from this file10 will show the current performance level. Writing to the11 file can change this value.12 13 Valid options:14 - "silent"15 - "normal"16 - "overclock"17 18 Note that not all laptops support all of these options.19 Specifically, not all support the "overclock" option,20 and it's still unknown if this value even changes21 anything, other than making the user feel a bit better.22 23What: /sys/devices/platform/samsung/battery_life_extender24Date: December 1, 201125KernelVersion: 3.326Contact: Corentin Chary <corentin.chary@gmail.com>27Description: Max battery charge level can be modified, battery cycle28 life can be extended by reducing the max battery charge29 level.30 31 - 0 means normal battery mode (100% charge)32 - 1 means battery life extender mode (80% charge)33 34What: /sys/devices/platform/samsung/usb_charge35Date: December 1, 201136KernelVersion: 3.337Contact: Corentin Chary <corentin.chary@gmail.com>38Description: Use your USB ports to charge devices, even39 when your laptop is powered off.40 1 means enabled, 0 means disabled.41 42What: /sys/devices/platform/samsung/lid_handling43Date: December 11, 201444KernelVersion: 3.1945Contact: Julijonas Kikutis <julijonas.kikutis@gmail.com>46Description: Some Samsung laptops handle lid closing quicker and47 only handle lid opening with this mode enabled.48 1 means enabled, 0 means disabled.49