linux-kernel - Re: wake up from a serial port

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Message-ID: <20070912210639.GA10172@elmicha>
Date:	Wed, 12 Sep 2007 23:06:39 +0200
From:	Michael Mauch <michael.mauch@....de>
To:	linux-kernel@...r.kernel.org
Subject: Re: wake up from a serial port

Guennadi Liakhovetski wrote:

> Enable wakeup from serial ports, make it run-time configurable over sysfs, 
> e.g.,
> 
> echo enabled > /sys/devices/platform/serial8250.0/tty/ttyS0/power/wakeup

Interesting, but how does that work from a user's/hardware perspective?

Do I have to pull DSR/RI to +12V? Can I use one of the other pins to get
these +12V (i.e. a switch and a resistor to shorten these pins is
enough)?

And probably in the BIOS I have to enable "wake on modem ring" (or
something similar)?

Regards...
		Michael
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