Difference between revisions of "Kernel-power"

__NOTOC__

= Power Management =

Power administration on uWink terminals is done by different applications, based on which hardware is handled.

* ACPI for macmini, used to set "Suspend on RAM"

* dpms on DT, used to turn off the screen

== ACPI ==

==== Suspend ====

Issue the following command on the terminal to be suspended:

<pre><nowiki>

echo mem > /sys/power/state

</nowiki></pre>

==== Wake ====

From a remote terminal isue the following command:

<pre><nowiki>

ether-wake 11:22:33:AA:BB:CC

</nowiki></pre>

where {{11:22:33:AA:BB:CC}} is the mac address of the terminal to be waked up.

Alternatively the following python code could be useful to wake up a terminal

<pre><nowiki>

#!/usr/bin/python

# Wake-On-LAN

#

# Copyright (C) 2002 by Micro Systems Marc Balmer

# Written by Marc Balmer, [email protected], http://www.msys.ch/

# This code is free software under the GPL

import struct, socket

def WakeOnLan(ethernet_address):

# Construct a six-byte hardware address

addr_byte = ethernet_address.split(':')

hw_addr = struct.pack('BBBBBB', int(addr_byte[0], 16),

int(addr_byte[1], 16),

int(addr_byte[2], 16),

int(addr_byte[3], 16),

int(addr_byte[4], 16),

int(addr_byte[5], 16))

# Build the Wake-On-LAN "Magic Packet"...

msg = '\xff' * 6 + hw_addr * 16

# ...and send it to the broadcast address using UDP

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)

s.sendto(msg, ('<broadcast>', 9))

s.close()

# Example use

WakeOnLan('00:16:CB:A2:96:C4')

</nowiki></pre>

== dpms ==

* Screen off*

To power off screen run the following command:

<pre><nowiki>

/usr/sbin/vbetool dpms off

</nowiki></pre>

'''Screen on'''

To power on screen run the following command:

<pre><nowiki>

/usr/sbin/vbetool dpms on

</nowiki></pre>