Re: CPU frequency scaling problem - laptop users, please check this

On Tue, May 24, 2011 at 9:17 PM, A. Kromic <akromic@xxxxxxxxx> 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

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