Re: [Xen-devel] Linux 3.4 dom0 kernel error loading xen-acpi-processor: Input/output error

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Mar 06, 2013 at 11:21:47PM +0200, Pasi Kärkkäinen wrote:
> On Wed, Mar 06, 2013 at 11:01:27PM +0200, Pasi Kärkkäinen wrote:
> > On Wed, Mar 06, 2013 at 10:41:39PM +0200, Pasi Kärkkäinen wrote:
> > > On Tue, Mar 05, 2013 at 12:45:15PM -0500, Konrad Rzeszutek Wilk wrote:
> > > > > 
> > > > > .. and thus ACPI_SUCCESS(status) is false. _PCT was not found.
> > > > > Any ideas why the Performance Control stuff can't be found? 
> > > > 
> > > > 
> > > > No, but I usually do one more thing to check my assumptions. I extract
> > > > the SSDT and DSDT:
> > > > 
> > > > cat /sys/firmware/acpi/DSDT > /tmp/dsdt
> > > >
> > > 
> > > In dom0:
> > > 
> > > cat: /sys/firmware/acpi/DSDT: No such file or directory
> > > 
> > > # ls /sys/firmware/acpi/
> > > interrupts  pm_profile  tables
> > >
> > 
> > Actually the correct path is: /sys/firmware/acpi/tables/DSDT
> > So the acpi tables are there.
> > 
> > .. but the problem is there's no _PCT info in them.
> > 
> 
> .. so on which hardware is xen-acpi-processor driver required? 
> 
> Is the actual problem that I don't have _PCT because it's not 
> required/supported on my hw,
> and thus I don't need the whole xen-acpi-processor driver? 
> 
> I checked the Xeon 5600 CPU, and also Ivy Bridge i7, and there's no _PCT on 
> either one..

I always forget which of _P* are important. I think _PPC, _PSS and _PCD
are the crucial ones. The _PCT is the thermal one - which I think are usually
found on laptops.

In your case then .. lets go back to the start - the driver failed with -EIO
and it was v3.4.x kernel? Now that I've figured out the regression with v3.9
I can take a look at this.

> 
> -- Pasi
> 

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