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

[Pasi Kärkkäinen <pasik@xxxxxx>]

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

 
> iasl -d /tmp/dsdt
> and search for the _PCT to make sure they are actually there.
>

I don't seem to have /sys/firmware/acpi/DSDT on baremetal either.. 
I wonder what's going on.. 

'acpidump' from pmtools seems to be able to dump the DSDT.
(on baremetal):

# acpidump --table DSDT -b -o dsdt.bin
# iasl -d dsdt.bin 

Intel ACPI Component Architecture
AML Disassembler version 20090123 [Oct 23 2012]
Copyright (C) 2000 - 2009 Intel Corporation
Supports ACPI Specification Revision 3.0a

Loading Acpi table from file dsdt.bin
Acpi table [DSDT] successfully installed and loaded
Pass 1 parse of [DSDT]
Pass 2 parse of [DSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
..............................................................................................................................................................................................................................................................................................................................................................
Parsing completed
Disassembly completed, written to "dsdt.dsl"


# grep -i pct dsdt.dsl | wc -l
0


# acpidump --table SSDT -b -o ssdt.bin
# iasl -d ssdt.bin 

Intel ACPI Component Architecture
AML Disassembler version 20090123 [Oct 23 2012]
Copyright (C) 2000 - 2009 Intel Corporation
Supports ACPI Specification Revision 3.0a

Loading Acpi table from file ssdt.bin
Acpi table [SSDT] successfully installed and loaded
Pass 1 parse of [SSDT]
Pass 2 parse of [SSDT]
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions)
................................................................................................................................................................................................................................................................................................................................................................................................................................................
Parsing completed
Disassembly completed, written to "ssdt.dsl"


# grep -i pct ssdt.dsl | wc -l
0


So uhm.. is this a BIOS/firmware bug? 


-- Pasi



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