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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>Shut down when turn computer off</H3>
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<p><strong>From pclouds
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</strong></p>
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<p></strong></p>
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<p align="right"><strong>Answered By Richard Adams, Frank Rodolf, Mike Orr
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</strong></p>
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<P><STRONG>
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What I think he is talking about is that with some computers (dell is
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the only one I know) that are running windowsNT if you hit the power
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button on the front of the pc they begin to do a software shutdown.
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</STRONG></P>
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<P><STRONG>
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Thats what he is asking how can he set it up so when he hits the power
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button that the machine notices this and goes into a software shutdown..
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</STRONG></P>
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<blockQuote>
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<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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> [Richard]
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Well look at it this way, by depressing the power button on the computer you
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start a shutdown, ok yes i now know what wa meant, what Linux has that no
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windows software has is "ctrl-alt-del" invokes the defined call in
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<TT>/etc/inittab</TT> by default its in short, "shutdown -r now" that one can change to
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use 'poweroff' 'shutdown' or 'reboot'.
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</blockQuote>
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<blockQuote>
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So instead of pressing the power button on the machine itself, hit
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ctrl-alt-delete, advantage of that is no need to streach to reach the machine
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as the keyboard is right in front of you.
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</blockQuote>
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<blockQuote>
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<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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> [Mike]
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There is also a POWERFAIL signal Linux uses to signal the detection of an
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imminent power failure. It's meant for emergencies, but maybe you can somehow
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latch onto that infrastructure. But an option like 'ctrlaltdel' in
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'<TT>/etc/inittab</TT>' would be more ideal.
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</blockQuote>
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<blockQuote>
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ATX-style computers have a momentary on/off switch that can (somehow) be
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made to trigger the "shutdown" command -- maybe. I'm not sure how it's done.
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Look through "man inittab", "man init" and the kernel documentation, and
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maybe you'll get an idea.
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</blockQuote>
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<blockQuote>
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This won't work with older AT-stype cases and motherboards because they have
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a true 2-position switch. When you turn the switch off, it cuts the power
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mechanically, and Linux doesn't know about it. Even if Linux did know about it,
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there's not enough processor cycles left for Linux to do a clean shutdown
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before it dies.
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</blockQuote>
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<blockQuote>
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<IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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> [Frank]
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I did some quick lookup... It seems acpid can do this - should be
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available with your distribution, or otherwise you can easily find it
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online.
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</blockQuote>
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<blockQuote>
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If not, there is also something called "Linux PowerSwitch Driver",
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which is meant exactly for what you want... You can find it at:
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</blockQuote>
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<blockQuote><BLOCKQuote>
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<A HREF="http://deadlock.et.tudelft.nl/~joris/powerswitch"
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>http://deadlock.et.tudelft.nl/~joris/powerswitch</A>
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</BLOCKQuote></blockQuote>
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<blockQuote>
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Hope this helps you!
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</blockQuote>
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<P><STRONG>
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<IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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>
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Thanks for all advices. I have got powerswitch. It work very well!
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</STRONG></P>
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<a href="http://www.linuxgazette.com/copying.html"
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<BR>Published in issue 73 of <I>Linux Gazette</I> December 2001</H5>
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