[ltp] Re: High-pitch noise on a T60

[David Abrahams]

on Wed Apr 23 2008, Michael Karcher <karcher-AT-physik.fu-berlin.de> wrote:

> Am Mittwoch, den 23.04.2008, 18:01 +0200 schrieb Elias Oltmanns:
>> Peter Lemken <ibm-thinkpad@bloatware.de> wrote:
>> > Howdy,
>> >
>> > I - like many others - have the high-pitch noise phenomenon when running on 
>> > battery.
>> >
>> > rmmod uhci_hcd completely solves the problem - but since my mouse is a USB 1.1 
>> > device, I am left without a mouse.
>> Perhaps you might want to give
>> 
>> CONFIG_HZ_100=y
> Nowadays, one usually wants CONFIG_NO_HZ=y to use dynamic ticks. If some
> high-pitched noise appears, something is working against CONFIG_NO_HZ,
> and powertop should show lots of wakeups and hopefully give hints who is
> guilty.

In that case try running powertop to see who the guilty parties are and
disable them.

-- 
Dave Abrahams
Boost Consulting
http://boost-consulting.com