CPU frequency scaling problem - laptop users, please check this

[Ioannis Vranos]

On Tue, May 24, 2011 at 9:17 PM, A. Kromic <akromic at gmail.com> wrote:
> On 05/24/2011 07:34 PM, NoOp wrote:
>>
>> Same with Natty. Your initial posts indicated that you had battery/power
>> issues.
>
> No, someone suggested that might be the problem, and I allowed that
> possibility then since I had the battery removed at the time. But when I
> tried working with battery inserted, absolutely nothing changed; so I
> eliminated that possibility.
>
>> You mention in your bug report "works perfectly with kernels up to
>> 2.6.32-24". But your last post: "Still not working with latest release
>> kernels: 2.6.32-32 (Lucid)". So I'm confused - with which kernel *is*
>> cpu scaling currently working on your machine?
>>
>>
> What I meant is this: my system's CPU scaling has worked and still works
> perfectly with all old kernels up to 2.6.32-24, with any kernel newer
> than that it doesn't work at all. I can reproduce it anytime, either
> chosing a kernel from GRUB, or by booting a live CD. Another fact
> perhaps worth noting is that it doesn't matter if it is a 32- or 64-bit
> Ubuntu - I've checked with both, and again the problem depends just on
> the kernel version.
>
> I don't quite get what the problem is, it seems it's quite rare. However
> so far, I couldn't find anything else but the kernel to blame, per the
> above mentioned fact. No amount of tinkering with other software (like
> acpi, cpu frequency managers etc.) not hardware (battery, BIOS options)
> showed any difference at all...
>
> And thanks again to everybody who tested!


Did you try running cpuburn in open terminals, as many as your CPU cores?



-- 
Ioannis Vranos

http://www.cpp-software.net