Messages in this thread Patch in this message | | | Date | Wed, 07 Dec 2011 23:38:07 +0100 | From | wallak@free ... | Subject | ACPI "_PDC" - acpi_processor_set_pdc()- execution regression - Linux-3.x |
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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 yield 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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