[parisc-linux] Power button on 712

[parisc-linux] Power button on 712

[Kaj-Michael Lang]

This might sound really strange but anyway:

Should the power button work under Linux ?
Even after halting I need to pull the cord to get my machine to power down,
as it won't respond to the the power button.

--
Kaj-Michael Lang , milang@tal.org

Re: [parisc-linux] Power button on 712

[Jan-Benedict Glaw]

On Thu, 2001-11-22 15:48:41 +0200, Kaj-Michael Lang <milang@tal.org>
wrote in message <003801c1735c$6581b7b0$56dc10c3@amos>:
> This might sound really strange but anyway:
> 
> Should the power button work under Linux ?
> Even after halting I need to pull the cord to get my machine to power down,
> as it won't respond to the the power button.

During initialisation of hardware (the front LED is blinking) you
can "easily" switch off the machine. But, after the OS was started,
it's not such a good idea to allow an user to simply fiddle with
the BRS (-> big red switch). Try to /sbin/poweroff or to /sbin/halt
your box and try again:-)

MfG, JBG

-- 
Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
	http://lug-owl.de/~jbglaw/software/snapshot2cvs/

Re: [parisc-linux] Power button on 712

[Jurij Smakov]

On Thu, 22 Nov 2001, Kaj-Michael Lang wrote:

> This might sound really strange but anyway:
> 
> Should the power button work under Linux ?
> Even after halting I need to pull the cord to get my machine to power down,
> as it won't respond to the the power button.

Hi!

That's not the normal behaviour. After I do a shutdown -h on a 712, the
LED on the front panel goes off and it is possible to turn off the power
using the front power switch. I have to pull the plug only after I get a
kernel panic or something like this.

Best regards,

Jurij.

RE: [parisc-linux] Power button on 712

[Witvliet, Hans]

Under hp-ux, if you press the "power-button" on the front, the system traps
it, and performs a "shutdown -h now"  (at least it takes ages to stop)
So the button on the front is not a BRS, but just generates a irq (on some
systems anyway....)

I presume this irq could be trapped under linux aswell, not?

Hans
	-----Original Message-----
	From:	Jan-Benedict Glaw [SMTP:jbglaw@lug-owl.de]
	Sent:	Thursday, November 22, 2001 2:53 PM
	To:	parisc-linux@lists.parisc-linux.org
	Subject:	Re: [parisc-linux] Power button on 712

	On Thu, 2001-11-22 15:48:41 +0200, Kaj-Michael Lang <milang@tal.org>
	wrote in message <003801c1735c$6581b7b0$56dc10c3@amos>:
	> This might sound really strange but anyway:
	> 
	> Should the power button work under Linux ?
	> Even after halting I need to pull the cord to get my machine to
power down,
	> as it won't respond to the the power button.

	During initialisation of hardware (the front LED is blinking) you
	can "easily" switch off the machine. But, after the OS was started,
	it's not such a good idea to allow an user to simply fiddle with
	the BRS (-> big red switch). Try to /sbin/poweroff or to /sbin/halt
	your box and try again:-)

	MfG, JBG

	-- 
	Jan-Benedict Glaw   .   jbglaw@lug-owl.de   .   +49-172-7608481
		http://lug-owl.de/~jbglaw/software/snapshot2cvs/

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	parisc-linux mailing list
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RE: [parisc-linux] Power button on 712

[Jurij Smakov]

On Thu, 22 Nov 2001, Witvliet, Hans wrote:

> Under hp-ux, if you press the "power-button" on the front, the system traps
> it, and performs a "shutdown -h now"  (at least it takes ages to stop)
> So the button on the front is not a BRS, but just generates a irq (on some
> systems anyway....)
> 
> I presume this irq could be trapped under linux aswell, not?

Hi!

I've posted a question about that on the list some time ago. According to
lasi docs, cutting of the power with the power switch should generate a
power failure interrupt, which I thought I could catch and make a clean
shutdown. I suppose, that it should be an interruption with code 2, so
I've added a handler for that in arch/parisc/kernel/traps.c (I think).
Well, it never became triggered by the power switch, and I have no idea,
why.

Best regards,

Jurij

Re: [parisc-linux] Power button on 712

[Grant Grundler]

Jan-Benedict Glaw wrote:
> But, after the OS was started,
> it's not such a good idea to allow an user to simply fiddle with
> the BRS (-> big red switch).

While that's true, the intent of the "soft-power" switch was in fact
to let a normal user safely power off the system. THe system needs
to poll the status of the switch and at some point decide it's
time to power off the box. I don't think docs for "soft power"
have been published. I have passed necessary information to
a few folks who've signed NDAs.

grant