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-What: /sys/devices/platform/samsung/performance_level
-Date: January 1, 2010
-KernelVersion: 2.6.33
-Contact: Greg Kroah-Hartman <>
-Description: Some Samsung laptops have different "performance levels"
- that are can be modified by a function key, and by this
- sysfs file. These values don't always make a whole lot
- of sense, but some users like to modify them to keep
- their fans quiet at all costs. Reading from this file
- will show the current performance level. Writing to the
- file can change this value.
- Valid options:
- "silent"
- "normal"
- "overclock"
- Note that not all laptops support all of these options.
- Specifically, not all support the "overclock" option,
- and it's still unknown if this value even changes
- anything, other than making the user feel a bit better.
-What: /sys/devices/platform/samsung/battery_life_extender
-Date: December 1, 2011
-KernelVersion: 3.3
-Contact: Corentin Chary <>
-Description: Max battery charge level can be modified, battery cycle
- life can be extended by reducing the max battery charge
- level.
- 0 means normal battery mode (100% charge)
- 1 means battery life extender mode (80% charge)
-What: /sys/devices/platform/samsung/usb_charge
-Date: December 1, 2011
-KernelVersion: 3.3
-Contact: Corentin Chary <>
-Description: Use your USB ports to charge devices, even
- when your laptop is powered off.
- 1 means enabled, 0 means disabled.