id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
504	Dell Vostro 1520: cpu throttle not working	Yuri Dario	eco	"CPU throttle fails with acpi 3.18 in /SMP /PIC mode.
Power Manager reports

{{{
D:\bin\powerman>POWERMAN.EXE
Power Manager 1.00
copyright 2011 by Blonde Guy, LLC
Waiting for client to connect
CPU 0 power 100 width 0
CPU 1 power 100 width 0
CPU 2 power 100 width 0
CPU 3 power 100 width 0
CPU current state=0 CPU Throttling steps=8
AcpiSetThrottling 88% for cpu 0
AcpiSetThrottling failed (65283) for cpu 0
AcpiSetThrottling 88% for cpu 1
AcpiSetThrottling failed (65283) for cpu 1
AcpiSetThrottling 88% for cpu 2
AcpiSetThrottling failed (65283) for cpu 2
AcpiSetThrottling 88% for cpu 3
AcpiSetThrottling failed (65283) for cpu 3
AcpiSetThrottling failed. Switching to set state
CPU throttling failed. Exiting.
}}}

With acpi 3.19 the daemon does not start at all.

I remember to have got the throttle acpi utility do work in the past with some acpi release (maybe .14 or .16); if I get time, I'll try older acpi releases.
"	defect	closed	major	Feedback pending	ACPI PSD	3.18	wontfix