Kernel-power: Difference between revisions
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#REDIRECT [[Power management]] |
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__NOTOC__ |
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= Power Management = |
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== ACPI == |
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=== How to switch to standby mode === |
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Issue the following command on the terminal to switch to suspend mode: |
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<pre><nowiki> |
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echo mem > /sys/power/state |
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</nowiki></pre> |
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=== How to perform a Wake-On-LAN (WoL) === |
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From a remote terminal isue the following command: |
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<pre><nowiki> |
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ether-wake 11:22:33:AA:BB:CC |
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</nowiki></pre> |
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where `11:22:33:AA:BB:CC` is the mac address of the terminal to be waked up. |
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Alternatively the following python code could be useful to wake up a terminal |
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<pre><nowiki> |
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#!/usr/bin/python |
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# Wake-On-LAN |
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# |
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# Copyright (C) 2002 by Micro Systems Marc Balmer |
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# Written by Marc Balmer, [email protected], http://www.msys.ch/ |
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# This code is free software under the GPL |
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import struct, socket |
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def WakeOnLan(ethernet_address): |
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# Construct a six-byte hardware address |
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addr_byte = ethernet_address.split(':') |
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hw_addr = struct.pack('BBBBBB', int(addr_byte[0], 16), |
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int(addr_byte[1], 16), |
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int(addr_byte[2], 16), |
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int(addr_byte[3], 16), |
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int(addr_byte[4], 16), |
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int(addr_byte[5], 16)) |
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# Build the Wake-On-LAN "Magic Packet"... |
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msg = '\xff' * 6 + hw_addr * 16 |
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# ...and send it to the broadcast address using UDP |
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
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s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1) |
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s.sendto(msg, ('<broadcast>', 9)) |
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s.close() |
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# Example use |
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WakeOnLan('00:16:CB:A2:96:C4') |
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</nowiki></pre> |
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== dpms == |
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=== How to manage the power on monitor with vbetool === |
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The screen can be handled directly from command line by executing `vbetool` command. |
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To power off screen run the following command: |
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<pre><nowiki> |
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/usr/sbin/vbetool dpms off |
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</nowiki></pre> |
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To power on screen run the following command: |
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<pre><nowiki> |
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/usr/sbin/vbetool dpms on |
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</nowiki></pre> |
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'''xorg''' |
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Ensure the following line is present in `/etc/X11/xorg.conf` in order to let GUI handle the blank screen. |
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<pre><nowiki> |
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Option "DPMS" |
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</nowiki></pre> |
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Latest revision as of 03:10, 11 June 2015
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