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From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [git pull] Input updates for 2.6.34-rc6
Date: Thu, 13 May 2010 14:05:44 -0700
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References: <20100513075728.GF30110@core.coreip.homeip.net> <20100513181002.GB23708@core.coreip.homeip.net> <alpine.LFD.2.00.1005131232350.3711@i5.linux-foundation.org>
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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?

-- 
Dmitry