We have a regression on the ACPI stack of the last linux kernel line 3.x (3.1.4,
3.2-rc4...). The ACPI "_PDC" chunk is not executed on some computers (e.g. Dell
X300; the function acpi_processor_set_pdc() is not called). This issue yields to
an uninitialized state of some ACPI variables.
A patch is available below. This patch come back to the previous linux behavior,
and works fine.
Best Regards,
Wallak.
--- linux-3.1.4-mdf/drivers/acpi/processor_core.c.orig 2011-12-07
23:12:57.000000000 +0100
+++ linux-3.1.4-mdf/drivers/acpi/processor_core.c 2011-12-07
23:13:39.000000000 +0100
@@ -223,8 +223,8 @@
type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
cpuid = acpi_get_cpuid(handle, type, acpi_id);
- if (cpuid == -1)
- return false;
+ if ((cpuid == -1) && (num_possible_cpus() > 1))
+ return false;
return true;
}
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