18c2ecf20Sopenharmony_ciWhat: /sys/devices/platform/samsung/performance_level 28c2ecf20Sopenharmony_ciDate: January 1, 2010 38c2ecf20Sopenharmony_ciKernelVersion: 2.6.33 48c2ecf20Sopenharmony_ciContact: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 58c2ecf20Sopenharmony_ciDescription: Some Samsung laptops have different "performance levels" 68c2ecf20Sopenharmony_ci that can be modified by a function key, and by this 78c2ecf20Sopenharmony_ci sysfs file. These values don't always make a whole lot 88c2ecf20Sopenharmony_ci of sense, but some users like to modify them to keep 98c2ecf20Sopenharmony_ci their fans quiet at all costs. Reading from this file 108c2ecf20Sopenharmony_ci will show the current performance level. Writing to the 118c2ecf20Sopenharmony_ci file can change this value. 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci Valid options: 148c2ecf20Sopenharmony_ci - "silent" 158c2ecf20Sopenharmony_ci - "normal" 168c2ecf20Sopenharmony_ci - "overclock" 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ci Note that not all laptops support all of these options. 198c2ecf20Sopenharmony_ci Specifically, not all support the "overclock" option, 208c2ecf20Sopenharmony_ci and it's still unknown if this value even changes 218c2ecf20Sopenharmony_ci anything, other than making the user feel a bit better. 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ciWhat: /sys/devices/platform/samsung/battery_life_extender 248c2ecf20Sopenharmony_ciDate: December 1, 2011 258c2ecf20Sopenharmony_ciKernelVersion: 3.3 268c2ecf20Sopenharmony_ciContact: Corentin Chary <corentin.chary@gmail.com> 278c2ecf20Sopenharmony_ciDescription: Max battery charge level can be modified, battery cycle 288c2ecf20Sopenharmony_ci life can be extended by reducing the max battery charge 298c2ecf20Sopenharmony_ci level. 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_ci - 0 means normal battery mode (100% charge) 328c2ecf20Sopenharmony_ci - 1 means battery life extender mode (80% charge) 338c2ecf20Sopenharmony_ci 348c2ecf20Sopenharmony_ciWhat: /sys/devices/platform/samsung/usb_charge 358c2ecf20Sopenharmony_ciDate: December 1, 2011 368c2ecf20Sopenharmony_ciKernelVersion: 3.3 378c2ecf20Sopenharmony_ciContact: Corentin Chary <corentin.chary@gmail.com> 388c2ecf20Sopenharmony_ciDescription: Use your USB ports to charge devices, even 398c2ecf20Sopenharmony_ci when your laptop is powered off. 408c2ecf20Sopenharmony_ci 1 means enabled, 0 means disabled. 418c2ecf20Sopenharmony_ci 428c2ecf20Sopenharmony_ciWhat: /sys/devices/platform/samsung/lid_handling 438c2ecf20Sopenharmony_ciDate: December 11, 2014 448c2ecf20Sopenharmony_ciKernelVersion: 3.19 458c2ecf20Sopenharmony_ciContact: Julijonas Kikutis <julijonas.kikutis@gmail.com> 468c2ecf20Sopenharmony_ciDescription: Some Samsung laptops handle lid closing quicker and 478c2ecf20Sopenharmony_ci only handle lid opening with this mode enabled. 488c2ecf20Sopenharmony_ci 1 means enabled, 0 means disabled. 49