1*4882a593SmuzhiyunWhat: /sys/devices/platform/samsung/performance_level 2*4882a593SmuzhiyunDate: January 1, 2010 3*4882a593SmuzhiyunKernelVersion: 2.6.33 4*4882a593SmuzhiyunContact: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 5*4882a593SmuzhiyunDescription: Some Samsung laptops have different "performance levels" 6*4882a593Smuzhiyun that can be modified by a function key, and by this 7*4882a593Smuzhiyun sysfs file. These values don't always make a whole lot 8*4882a593Smuzhiyun of sense, but some users like to modify them to keep 9*4882a593Smuzhiyun their fans quiet at all costs. Reading from this file 10*4882a593Smuzhiyun will show the current performance level. Writing to the 11*4882a593Smuzhiyun file can change this value. 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun Valid options: 14*4882a593Smuzhiyun - "silent" 15*4882a593Smuzhiyun - "normal" 16*4882a593Smuzhiyun - "overclock" 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun Note that not all laptops support all of these options. 19*4882a593Smuzhiyun Specifically, not all support the "overclock" option, 20*4882a593Smuzhiyun and it's still unknown if this value even changes 21*4882a593Smuzhiyun anything, other than making the user feel a bit better. 22*4882a593Smuzhiyun 23*4882a593SmuzhiyunWhat: /sys/devices/platform/samsung/battery_life_extender 24*4882a593SmuzhiyunDate: December 1, 2011 25*4882a593SmuzhiyunKernelVersion: 3.3 26*4882a593SmuzhiyunContact: Corentin Chary <corentin.chary@gmail.com> 27*4882a593SmuzhiyunDescription: Max battery charge level can be modified, battery cycle 28*4882a593Smuzhiyun life can be extended by reducing the max battery charge 29*4882a593Smuzhiyun level. 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun - 0 means normal battery mode (100% charge) 32*4882a593Smuzhiyun - 1 means battery life extender mode (80% charge) 33*4882a593Smuzhiyun 34*4882a593SmuzhiyunWhat: /sys/devices/platform/samsung/usb_charge 35*4882a593SmuzhiyunDate: December 1, 2011 36*4882a593SmuzhiyunKernelVersion: 3.3 37*4882a593SmuzhiyunContact: Corentin Chary <corentin.chary@gmail.com> 38*4882a593SmuzhiyunDescription: Use your USB ports to charge devices, even 39*4882a593Smuzhiyun when your laptop is powered off. 40*4882a593Smuzhiyun 1 means enabled, 0 means disabled. 41*4882a593Smuzhiyun 42*4882a593SmuzhiyunWhat: /sys/devices/platform/samsung/lid_handling 43*4882a593SmuzhiyunDate: December 11, 2014 44*4882a593SmuzhiyunKernelVersion: 3.19 45*4882a593SmuzhiyunContact: Julijonas Kikutis <julijonas.kikutis@gmail.com> 46*4882a593SmuzhiyunDescription: Some Samsung laptops handle lid closing quicker and 47*4882a593Smuzhiyun only handle lid opening with this mode enabled. 48*4882a593Smuzhiyun 1 means enabled, 0 means disabled. 49