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Date: Thu, 20 May 2010 00:08:55 -0700
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Len Brown <lenb@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [git pull] Input updates for 2.6.34-rc6
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On Thu, May 20, 2010 at 12:56:18AM -0400, Len Brown wrote:
> 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.
> 

Then we should probably revisit this? I am not saying that we need to
try evaluating more than Windows does but we still should add the
devices into the tree so their presence can be detected.

-- 
Dmitry