12d70b73aSGreg Kroah-HartmanWhat: /sys/devices/platform/samsung/performance_level 22d70b73aSGreg Kroah-HartmanDate: January 1, 2010 32d70b73aSGreg Kroah-HartmanKernelVersion: 2.6.33 4bc5bca53SGreg Kroah-HartmanContact: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 52d70b73aSGreg Kroah-HartmanDescription: Some Samsung laptops have different "performance levels" 6064cbc4fSGeert Uytterhoeven that can be modified by a function key, and by this 72d70b73aSGreg Kroah-Hartman sysfs file. These values don't always make a whole lot 82d70b73aSGreg Kroah-Hartman of sense, but some users like to modify them to keep 92d70b73aSGreg Kroah-Hartman their fans quiet at all costs. Reading from this file 102d70b73aSGreg Kroah-Hartman will show the current performance level. Writing to the 112d70b73aSGreg Kroah-Hartman file can change this value. 12*34433332SMauro Carvalho Chehab 132d70b73aSGreg Kroah-Hartman Valid options: 14*34433332SMauro Carvalho Chehab - "silent" 15*34433332SMauro Carvalho Chehab - "normal" 16*34433332SMauro Carvalho Chehab - "overclock" 17*34433332SMauro Carvalho Chehab 182d70b73aSGreg Kroah-Hartman Note that not all laptops support all of these options. 192d70b73aSGreg Kroah-Hartman Specifically, not all support the "overclock" option, 202d70b73aSGreg Kroah-Hartman and it's still unknown if this value even changes 212d70b73aSGreg Kroah-Hartman anything, other than making the user feel a bit better. 22cb5b5c91SCorentin Chary 23cb5b5c91SCorentin CharyWhat: /sys/devices/platform/samsung/battery_life_extender 24cb5b5c91SCorentin CharyDate: December 1, 2011 25cb5b5c91SCorentin CharyKernelVersion: 3.3 26cb5b5c91SCorentin CharyContact: Corentin Chary <corentin.chary@gmail.com> 27cb5b5c91SCorentin CharyDescription: Max battery charge level can be modified, battery cycle 28cb5b5c91SCorentin Chary life can be extended by reducing the max battery charge 29cb5b5c91SCorentin Chary level. 30*34433332SMauro Carvalho Chehab 31*34433332SMauro Carvalho Chehab - 0 means normal battery mode (100% charge) 32*34433332SMauro Carvalho Chehab - 1 means battery life extender mode (80% charge) 333a75d378SCorentin Chary 343a75d378SCorentin CharyWhat: /sys/devices/platform/samsung/usb_charge 353a75d378SCorentin CharyDate: December 1, 2011 363a75d378SCorentin CharyKernelVersion: 3.3 373a75d378SCorentin CharyContact: Corentin Chary <corentin.chary@gmail.com> 383a75d378SCorentin CharyDescription: Use your USB ports to charge devices, even 393a75d378SCorentin Chary when your laptop is powered off. 403a75d378SCorentin Chary 1 means enabled, 0 means disabled. 41b0dcaf4fSJulijonas Kikutis 42b0dcaf4fSJulijonas KikutisWhat: /sys/devices/platform/samsung/lid_handling 43b0dcaf4fSJulijonas KikutisDate: December 11, 2014 44b0dcaf4fSJulijonas KikutisKernelVersion: 3.19 45b0dcaf4fSJulijonas KikutisContact: Julijonas Kikutis <julijonas.kikutis@gmail.com> 46b0dcaf4fSJulijonas KikutisDescription: Some Samsung laptops handle lid closing quicker and 47b0dcaf4fSJulijonas Kikutis only handle lid opening with this mode enabled. 48b0dcaf4fSJulijonas Kikutis 1 means enabled, 0 means disabled. 49