Power saving tweaks

[Iguleder]

Here are some power-saving tweaks you can use to increase battery life, they're very useful on netbooks. You can add these lines of code to any script that runs when Puppy boots, init scripts or /root/.xinitrc.

It makes sense to add these to .xinitrc, Puppy boots faster when power saving is disabled and once it's up, power saving is enabled

They can cause some problems, so be careful and check all default values before you apply these, just in case

Note: there's another trick that enables automatic suspend for USB devices that report no activity, I don't recommend it because it makes USB mice freeze

Enable power saving on wlan0:

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iwpriv wlan0 set_power 5

Enable power saving on multicore machines (may harm performance!):

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echo 1 > /sys/devices/system/cpu/sched_mc_power_savings

Enable power saving on multi-threaded CPUs (Atom, Pentium 4 ...):

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echo 1 > /sys/devices/system/cpu/sched_smt_power_savings

Enable SCSI power saving:

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echo min_power > /sys/class/scsi_host/host0/link_power_management_policy

Increase dirty_writebacks from 5 seconds to 15 seconds and turn on laptop mode:

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echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
echo 5 > /proc/sys/vm/laptop_mode

Turn off the Bluetooth interface hci0 on boot (if you have a proper Bluetooth management applet you can turn Bluetooth on when you need it):

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hciconfig hci0 down

Set the brightness to 0 on boot (you can increase it manually anyway):

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echo 0 > /sys/class/backlight/acpi_video0/brightness

Other nice ideas:
- Set the brightness to 0 on init scripts, then set it to the default with .xinitrc.
- The same with all other tweaks.
- Make the init scripts check the battery status through /proc and /sys and enable/disable these tweaks according to it, i.e if it's at 20% or less, the script applies power saving.