Whining noice from CPU(Ubuntu 9.10)

[CosyCat]

hello, I always had whining CPU noice on my 2.1 MacBook but got help fixing it under OSX and Ubuntu 8.04 and 8.10 but now when upgrading to 9.10(clean install of RC on my macbook)I´m back to whining CPU and nothing seems to work

this problem https://help.ubuntu.com/community/MacBook2-1/Hardy#Whining%20noise
I dual boot snow leopard and Ubuntu 9.10

Intel graphic in 9.10 is so nice so I like to set Ubuntu as default os but this whine is holding me back.

Someone know how to silent my CPU.

THX

[CosyCat]

I bump this thread and ask another Q that might help me fix my problem.

how can this be don in koala?
http://www.inliniac.net/blog/2008/07/25/fixing-noise-on-ubuntu-hardy-804-aka-setting-max_cstate.html
set my cpu to "max_cstate=2"

thx again and hope someone know

edit:
looks like I fixed it!)

This is how I did it in terminal
sudo pico grub.cfg
edit this row with "processor.max_cstate=2" at the end like this
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=b366eab5-0f04-4e8c-9459-0ffd0e6d1b58 ro quiet splash processor.max_cstate=2


Saved and restart MacBook

No whining :)

[karlstad]

Is there no other way? I'd love it if I could do this realtime or something, like the old days when you just echo'd "2" to /sys/module/processor/parameters/max_cstate

[boomshop]

Hi,

I fear there's not. And the described one will unfortunately only last until anything or anyone updates the grub config, since the file /boot/grub/grub.cfg is written by grub2 as stated in the header.

In grub2 some things (like default kernel options) are done in /etc/default/grub, so you have to edit this file:


sudo pico /etc/default/grub

search for the line GRUB_CMDLINE_LINUX="" and change to (or add if it doesn't exist):


GRUB_CMDLINE_LINUX="processor.max_cstate=2"

press STRG+x and y to save and exit and execute the grub update:


sudo update-grub

It will rewrite your actual grub configuration with the new kernel option and will affect all kernels in /boot.

Greetz, markus.


I think it should better be "sudo update-grub2"

[laxhodu]

Default Re: please check my site
Thanks for the suggestion, I wish it had worked.

[jdriessen]

yes, Boomshop's post fixed mine. (macbook2,1)

[Morientes]

Any of you know how much setting the max cstate to 2 will affect battery life?

[boomshop]

Hey!

You can measure it easily:

http://www.thinkwiki.org/wiki/How_to_measure_power_consumption