On Thu, 2008-10-23 at 22:42 +0200, Rafael J. Wysocki wrote:
quoted text
> 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?

James


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