[LAU] thinkpad t61 noise
dominic.sacre at gmx.de
Fri Oct 1 11:24:18 UTC 2010
On Fri, Oct 1, 2010 at 12:23 PM, rosea grammostola
<rosea.grammostola at gmail.com> wrote:
> My thinkpad t61 makes a high frequency sound, pipipipipippi, not very
> loud. Funny thing, when I stick in the usb mouse, it's gone... I only
> have this issue when on battery. Suggestions for solution?
Many Thinkpads (and other laptops as well) emit high-pitched noise
when the CPU periodically goes into power save mode. As far as I know
there is no real solution. You can change some kernel or BIOS settings
to (partially) disable power saving, but that might reduce your
battery life quite significantly.
I once had a similar problem which could also be "solved" by plugging
in USB devices. Turns out there was a bug in the USB kernel driver
which caused continuous CPU wake-ups, and thus prevented the CPU from
going into deep sleep modes. This stopped the noise, but also
increased power consumtion by a couple of watts...
Incidentally, another way to keep the CPU awake is to simply run JACK :)
This page has a lot more information and many potential workarounds:
More information about the Linux-audio-user