1What: /sys/devices/platform/samsung/performance_level 2Date: January 1, 2010 3KernelVersion: 2.6.33 4Contact: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 5Description: Some Samsung laptops have different "performance levels" 6 that are can be modified by a function key, and by this 7 sysfs file. These values don't always make a whole lot 8 of sense, but some users like to modify them to keep 9 their fans quiet at all costs. Reading from this file 10 will show the current performance level. Writing to the 11 file can change this value. 12 Valid options: 13 "silent" 14 "normal" 15 "overclock" 16 Note that not all laptops support all of these options. 17 Specifically, not all support the "overclock" option, 18 and it's still unknown if this value even changes 19 anything, other than making the user feel a bit better. 20 21What: /sys/devices/platform/samsung/battery_life_extender 22Date: December 1, 2011 23KernelVersion: 3.3 24Contact: Corentin Chary <corentin.chary@gmail.com> 25Description: Max battery charge level can be modified, battery cycle 26 life can be extended by reducing the max battery charge 27 level. 28 0 means normal battery mode (100% charge) 29 1 means battery life extender mode (80% charge) 30 31What: /sys/devices/platform/samsung/usb_charge 32Date: December 1, 2011 33KernelVersion: 3.3 34Contact: Corentin Chary <corentin.chary@gmail.com> 35Description: Use your USB ports to charge devices, even 36 when your laptop is powered off. 37 1 means enabled, 0 means disabled. 38 39What: /sys/devices/platform/samsung/lid_handling 40Date: December 11, 2014 41KernelVersion: 3.19 42Contact: Julijonas Kikutis <julijonas.kikutis@gmail.com> 43Description: Some Samsung laptops handle lid closing quicker and 44 only handle lid opening with this mode enabled. 45 1 means enabled, 0 means disabled. 46