Linux On My Samsung

Code: Select all

#!/bin/sh

case $1 in
  true)
 
    # Running on battery
    printf "enable battery mode"
    # Disable the NMI watchdog
    echo 0 > /proc/sys/kernel/watchdog
 
    # Reduce power for SATA link power management
    for i in 0 1 2 3 4 5 ; do
        echo min_power>/sys/class/scsi_host/host${i}/link_power_management_policy
    done
 
    # Runtime power-management for PCI devices
    for i in /sys/bus/pci/devices/*/power/control ; do
        echo auto > ${i}
    done
 
    # Runtime power-management for USB devices
    for i in /sys/bus/usb/devices/*/power/control ; do
        echo auto > ${i}
    done
 
    # Disable Wake-on-LAN and ethernet port
    ethtool -s eth0 wol d
    ifconfig eth0 down
 
    # Reduce the VM write-back timeout
    sleep 1000 && echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
 
  ;;
  false)
 
    # Running on charger
    printf "enable ac mode"
    # Enable the NMI watchdog
    echo 1 > /proc/sys/kernel/watchdog
 
    # Increase the VM write-back timeout
    echo 60000 > /proc/sys/vm/dirty_writeback_centisecs
 
    # Change power-saving for SATA devices
    for i in 0 1 2 3 4 5 ; do
        echo min_power>/sys/class/scsi_host/host${i}/link_power_management_policy
    done
 
    # Enable full power for PCI devices
    for i in /sys/bus/pci/devices/*/power/control ; do
        echo on > ${i}
    done
 
    # Enable Wake-on-LAN and ethernet port
    ethtool -s eth0 wol g
    ifconfig eth0 up
  ;;
esac
exit 0