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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