Documentation/ABI/testing/sysfs-driver-samsung-laptop

   1 What:           /sys/devices/platform/samsung/performance_level
   2 Date:           January 1, 2010
   3 KernelVersion:  2.6.33
   4 Contact:        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
   5 Description:    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
  21 What:           /sys/devices/platform/samsung/battery_life_extender
  22 Date:           December 1, 2011
  23 KernelVersion:  3.3
  24 Contact:        Corentin Chary <corentin.chary@gmail.com>
  25 Description:    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
  31 What:           /sys/devices/platform/samsung/usb_charge
  32 Date:           December 1, 2011
  33 KernelVersion:  3.3
  34 Contact:        Corentin Chary <corentin.chary@gmail.com>
  35 Description:    Use your USB ports to charge devices, even
  36                 when your laptop is powered off.
  37                 1 means enabled, 0 means disabled.
  38
  39 What:           /sys/devices/platform/samsung/lid_handling
  40 Date:           December 11, 2014
  41 KernelVersion:  3.19
  42 Contact:        Julijonas Kikutis <julijonas.kikutis@gmail.com>
  43 Description:    Some Samsung laptops handle lid closing quicker and
  44                 only handle lid opening with this mode enabled.
  45                 1 means enabled, 0 means disabled.