linux-kernel - Re: [git pull] Input updates for 2.6.34-rc6

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Date:	Thu, 20 May 2010 00:56:18 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] Input updates for 2.6.34-rc6

On Thu, 13 May 2010, Dmitry Torokhov wrote:

> On Thursday 13 May 2010 12:40:43 pm Linus Torvalds wrote:
> > On Thu, 13 May 2010, Dmitry Torokhov wrote:
> > > You don't have anything plugged into the ports though, do you?
> > 
> > No. It's a modern machine. But the port is there, and we've been very good
> > at booting up and finding keyboards later (I've done it myself - headless
> > machines that you hotplug a PS/2 keyboard into: it's not necessarily
> > technically something you're supposed to do, but it has worked fine for
> > me).
> > 
> > > I wonder what your DSDT looks like.
> 
> [... pulling LKML back in...]
> 
> Lookie, lookie:
> 
>                 Device (PS2K)
>                 {
>                     Name (_HID, EisaId ("PNP0303"))
>                     Name (_CID, EisaId ("PNP030B"))
>                     Method (_STA, 0, NotSerialized)
>                     {
>                         ShiftLeft (One, 0x0A, Local0)
>                         If (And (IOST, Local0))
>                         {
>                             Return (0x0F)
>                         }
> 
>                         Return (Zero)
>                     }
> ...
> 
>                 Device (PS2M)
>                 {
>                     Name (_HID, EisaId ("PNP0F03"))
>                     Name (_CID, EisaId ("PNP0F13"))
>                     Method (_STA, 0, NotSerialized)
>                     {
> 
> But I guess because there are no devices plugged in ACPI they are "inactive" 
> and thus ACPI drop them. I was always wondered by ACPI did that. Len?

I guess only a Windows person could answer this --
since it is really a Windows-ism, rather than something that
makes any sense based on what is in the ACPI spec itself.

cheers,
Len Brown, Intel Open Source Technology Center

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