CPU frequency scaling problem - laptop users, please check this

[Ioannis Vranos]

On Tue, May 24, 2011 at 10:12 PM, A. Kromic <akromic at gmail.com> wrote:
> On 05/24/2011 08:58 PM, Ioannis Vranos wrote:
>>
>> Did you try running cpuburn in open terminals, as many as your CPU cores?
>>
>>
>>
> No, I've long ago noticed that CPU never goes above lowest speed at full
> load even with the most aggressive governor, and believe me I've tried
> doing quite a bit of testing since I discovered this. ;) However, that
> particular test doesn't matter since the CPU should change frequency
> when set explicitly (instead of being handled automatically by the
> governor) which it doesn't. The problem isn't the _automatic_ scaling,
> but scaling in general doesn't work at all...
>
> I think I've also tried at some time writing directly to /sys interfaces
> which should always work, but no luck...


However my system is an Intel Core 2 Duo, and it scales OK with
cpuburn, from 800 MHz to 2.5 GHz (both Cores with 2 cpuburns).

Also I noticed than when I changed the profile in "CPU frequency
scaling monitor" GNOME applet, to "Performance", only one Core
switched to 2.5 GHz, the other one remained in 800 MHz.



-- 
Ioannis Vranos

http://www.cpp-software.net