linux-kernel - Re: ACPI locks hardware devices when it doesn't detect vista

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Date:	Sat, 22 Aug 2009 23:41:06 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Mairo <rety@...zta.onet.pl>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: ACPI locks hardware devices when it doesn't detect vista

On Saturday 22 August 2009, Maxim Levitsky wrote:
> Hi,
> 
> <joke>
> This should be brought to a Microsoft antitrust case...
> </joke>
> 
> 
> Today many notebooks ship with a embedded infrared receiver.
> In Vista there is new subsystem that decodes these signals.
> (of course it works only with Microsoft Certificated Remotes (TM)...)
> 
> The receiver is usually presented to system as a pnp device 
> (using acpi tables)
> 
> It turns out that some bioses actually use the OSI, ACPI feature of the
> operation system to detect if running inside Vista. If not they disable
> the infrared receiver.

Oh well.

That should've been Cced to linux-acpi (now added).  I'm looking forward to
seeng a comment from Len. 

> On my system this it is still tolerable:
> 
>             Device (MIR)
>             {
>                 Name (_HID, EisaId ("ENE0100"))
>                 Method (_STA, 0, NotSerialized)
>                 {
>                     If (LGreaterEqual (OSYS, 0x07D6))
>                     {
>                         If (LOr (And (OTHR, 0x02), And (OTHR, 0x40)))
>                         {
>                             Return (0x00)
>                         }
>                         Else
>                         {
>                             Return (0x0F)
>                         }
>                     }
>                     Else
>                     {
>                         Return (0x00)
>                     }
>                 }
> 
> But not so, on Mairo's system:
> 
>             Device (MIR)
>             {
>                 Name (_HID, EisaId ("ENE0100"))
>                 Method (_STA, 0, NotSerialized)
>                 {
>                     If (LAnd (MCIR, LEqual (OSYS, 0x07D6)))
>                     {
>                         Return (0x0F)
>                     }
>                     Else
>                     {
>                         Store (Zero, ^^LPCB.IOR2)
>                         Return (Zero)
>                     }
>                 }
> 
> 	.......
> 
>     Method (_WAK, 1, NotSerialized)
>     {
>     .......
>         If (Not (LAnd (MCIR, LEqual (OSYS, 0x07D6))))
>         {
>             Store (Zero, \_SB.PCI0.LPCB.IOR2)
>         }
> 
> 
> .....
> 
>     Scope (_SB)
>     {
>         Method (_INI, 0, NotSerialized)
>         {
>             If (DTSE)
>             {
>                 TRAP (0x47)
>             }
> 
>             Store (0x07D0, OSYS)
>             If (CondRefOf (_OSI, Local0))
>             {
>                 If (_OSI ("Linux"))
>                 {
>                     Store (One, LINX)
>                     Store (Zero, ECDY)
>                 }
> 
>                 If (_OSI ("Windows 2001"))
>                 {
>                     Store (0x07D1, OSYS)
>                 }
> 
>                 If (_OSI ("Windows 2001 SP1"))
>                 {
>                     Store (0x07D1, OSYS)
>                 }
> 
>                 If (_OSI ("Windows 2001 SP2"))
>                 {
>                     Store (0x07D2, OSYS)
>                 }
> 
>                 If (_OSI ("Windows 2006"))
>                 {
>                     Store (0x07D6, OSYS)
>                 }
> 
>                 If (LEqual (TPMV, One))
>                 {
>                     If (LLessEqual (OSYS, 0x07D2))
>                     {
>                         TRAP (0x49)
>                     }
>                 }
>             }
> 
>             If (LAnd (MPEN, LEqual (OSYS, 0x07D1)))
>             {
>                 TRAP (0x3D)
>             }
> 
>             TRAP (0x2B)
>         }
>     }
> 
> We have tried to boot the system with acpi_osi="Windows 2006", but it
> didn't help (kernel log confirmed that this parameter was set)
> 
> The only explanation I think of is ether his laptop is whitelisted on
> osi=Linux, or that _SB._INI is called by linux _after_ MIR._STA
> or that acpi_osi isn't yet in charge when _SB._INI is called.
> 
> 
> The kernel in question is quite recent kernel, (2.6.30.5 from debian
> unstable).
> 
> 
> The only way I managed to 'enable' this device is to 
> do 'sudo setpci -s 00:1f.0 0x88.W=0x701'
> 
> Or in other words undo the damage done by these ACPI commands.
> 
> Mairo, can you boot the system with acpi=off, and then poke the cir IO
> range (0x700-0x703) ?

Best,
Rafael
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