https://bugzilla.kernel.org/show_bug.cgi?id=187311

--- Comment #5 from Srinivas Pandruvada <[email protected]> 
---
Experimented on a Haswell system and simulated _PPC change via TDP change to
make sure that 

"static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)"

is called and _PPC change is notified via processor_perflib.c.

So this path is not broken. So if the BIOS notifies via  
ACPI_PROCESSOR_NOTIFY_PERFORMANCE, _PPC will be read again and work correctly.

So something caused thinkpad x60 to not send any _PPC change notification.

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