[Bug 15539] i5 Clarkdale CPUs (e.g., Intel Core i5 6XX) don't respect powersave CPU governor

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https://bugzilla.kernel.org/show_bug.cgi?id=15539


Zhang Rui <rui.zhang@xxxxxxxxx> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |acpi-bugzilla@xxxxxxxxxxxxx
                   |                            |orge.net,
                   |                            |rui.zhang@xxxxxxxxx
         AssignedTo|cpufreq@xxxxxxxxxxxxxxx     |rui.zhang@xxxxxxxxx




--- Comment #2 from Zhang Rui <rui.zhang@xxxxxxxxx>  2010-07-01 01:23:16 ---
(In reply to comment #0)
> Description of problem: I have enabled the powersave governor on my Intel Core
> i5 CPU and theoretically the CPU frequency should stay at 1200MHz, however
> according to i7z utility and temperature sensors, CPU is indeed running at its
> maximum speed.
> 
> Version-Release number of selected component (if applicable): all known kernel
> versions, acpi_cpufreq module
> 
> How reproducible: always
> 
> Steps to Reproduce:
> 1. enable powersave cpu frequency governor

what do you do to enable the powersave governor?

> 2. run cat < /dev/urandom > /dev/null
> 3. run i7z utility
> 
> Actual results: CPU frequency soars to 3200MHz according to i7z *direct* MSR
> readings, and temperature sensors readings
> 
> Expected results: CPU speed kept at 1200MHz
> 
> Additional info: I have Intel Core i5 650 CPU and H55 chipset based motherboard

please attach the output of "grep . /sys/devices/system/cpu/cpu0/cpufreq/*" of
your desktop.

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