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

[Daniel Castro]

The noise... right... do you notice it more when the cpu is more loaded?
Well... try to mute the mic... i suppose you are using ALSA drivers, so 
do alsamixer on the terminal and mute the mic.
I had a noise problem that I fixed like that as suggested on ubuntu forums.

________________________

Daniel Castro
Networking and Distributed Systems
Computer Science
Trinity College Dublin

Mobile: 083-318-2058
86.4.3 Trinity Hall, Dartry Road, Dublin 6
________________________



Thomas Kahle wrote:
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> Hi,
>
> I have the same problem. I cannot accept to disable C3 states and on the
> other hand unloading uhci-hcd removes the noise.
>
> So, some observations:
>
> - -) Maybe it's the fingerprintreader ?
> It is an USB device, it's cheap, its low-speed ... ?
> - -) removing the module, and reinserting it instantly gives back the
> noise while removing it and waiting 2 minutes before loading it back
> removes the noise ... for some time.
>
> thanks
> tom
>
> Michael Karcher 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.
> |
> | 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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