1. disable bluetooth
hciconfig hci0 down
rmmod hci_usb
2. change scaling mode
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
3. stop cdrom polling
hal-disable-polling --device /dev/scd0
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