>-----Original Message-----
>From:
linux-acpi-owner@vger.kernel.org [mailto:linux-acpi-
>owner@vger.kernel.org] On Behalf Of Rafael J. Wysocki
>Sent: Thursday, October 23, 2008 11:48 PM
>To: James Bottomley
>Cc: linux-acpi@vger.kernel.org; linux-kernel; Jesse Barnes; Len Brown; Lin,
>Ming M
>Subject: Re: Oops in ACPI with git latest
>
>On Friday, 24 of October 2008, James Bottomley wrote:
>> On Thu, 2008-10-23 at 22:42 +0200, Rafael J. Wysocki wrote:
>> > On Thursday, 23 of October 2008, James Bottomley wrote:
>> > > ACPI Warning (nseval-0168): Insufficient arguments - method [_OSC]
>needs 5, found 4 [20080926]
>> > > ACPI Warning (nspredef-0252): \_SB_.PCI0._OSC: Parameter count
>mismatch - ASL declared 5, expected 4 [20080926]
>> > > ACPI Error (nspredef-0163): \_SB_.PCI0._OSC: Missing expected return
>value [20080926]
>> > > BUG: unable to handle kernel NULL pointer dereference at 00000000
>> > Does this patch help?
>> >
>> > ---
>> > drivers/pci/pci-acpi.c | 3 +++
>> > 1 file changed, 3 insertions(+)
>> >
>> > Index: linux-2.6/drivers/pci/pci-acpi.c
>> > ===================================================================
>> > --- linux-2.6.orig/drivers/pci/pci-acpi.c
>> > +++ linux-2.6/drivers/pci/pci-acpi.c
>> > @@ -83,6 +83,9 @@ static acpi_status acpi_run_osc(acpi_han
>> > if (ACPI_FAILURE(status))
>> > return status;
>> >
>> > + if (!output.pointer)
>> > + return AE_NULL_OBJECT;
>> > +
>> > out_obj = output.pointer;
>> > if (out_obj->type != ACPI_TYPE_BUFFER) {
>> > printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
>>
>> Yes, that seems to fix it, thanks! ... I suppose the ASL error and
>> warnings need investigating too?
>
>Unfortunately, they seem to indicate a BIOS breakage.
>
>According to the spec, _OSC should take 4 arguments, but apparently on your
>system it wants 5.
>
>The output of acpidump may be helpful, as Lin Ming already said.
>
>Thanks,
>Rafael
>
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