On Mon, Aug 25, 2003 at 02:11:10PM +0200, [EMAIL PROTECTED] wrote: > > > > > > First, trust me. I'm really seriously interested in understanding the > potential of this.
There are two aspects to how most modern power-off buttons work: 1) They send a signal that software can detect. 2) They cause the BIOS to shut off the machine. Most systems are configured so that you need to hold down the button for several seconds for action #2. The 4-second thing people have talked about here isn't that the power-off happens 4 seconds after you press the button - it's that you have to hold the button down for 4 seconds or nothing happens. The purpose of action #2 is to shut down a machine that refuses to turn off because it's wedged or otherwise incapable of shutting itself down in response to action #1. Nathan Meyers [EMAIL PROTECTED] > Jason Stubbs <[EMAIL PROTECTED]> said: > "Usually the button is configurable in BIOS so that it either powers off > straight away or powers off after the button is held for 4 seconds" > > - Does this mean that the OS has no more than 4 seconds to do a clean > shutdown? (I douth so, since I couldn't make this happen on the most > feature-poor of any of my Linux installations, no matter the distro.) > > > - If not, what happens? Does the OS tell the BIOS that "OK, I promise you > to do a shutdown and a software driven power off. Trust me." ? By braking > that promise, the OS could effectively inhibit a power off action. > > > I doubt both of the above and believe that something smarter is going on. I > just wonder how it's designed to work. > > > Sorry to be so nagging about this, but I can see some interesting usage of > this. > Gus > > > -- > [EMAIL PROTECTED] mailing list > > > -- -- [EMAIL PROTECTED] mailing list
