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

[Michael Karcher]

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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 runnin=
g on=20
> > battery.
> >
> > rmmod uhci_hcd completely solves the problem - but since my mouse is a =
USB 1.1=20
> > device, I am left without a mouse.
> Perhaps you might want to give
>=20
> CONFIG_HZ_100=3Dy
Nowadays, one usually wants CONFIG_NO_HZ=3Dy 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.

Do you have any other USB 1.1 devices (for example a USB missile
launcher, that thing *is* cheap china crap) that might send data at a
rate of 1kHz? You could look at the output of lsusb.

Regards,
  Michael Karcher

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