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[Launchpad Bug Tracker <93067@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/93067

Title:
  High pitch noise from CPU when on battery

Status in “linux” package in Ubuntu:
  Expired
Status in “linux-source-2.6.20” package in Ubuntu:
  Won't Fix

Bug description:
  Binary package hint: linux-source-2.6.20

  Hi,

  I have a very annoying nigh pitch noise on all of my newer laptops (hp
  nx8220, nw-series, thinkpad x60 and x60s) when on battery, cpu is
  idling on lowest step and no usb device is plugged in, as descripted
  here: http://www.thinkwiki.org/wiki/Problem_with_high_pitch_noises
  #Solutions_for_CPU-triggered_noise

  # echo 2 > /sys/module/processor/parameters/max_cstate solves the
  problem for me, although it was not necessary to do anything in edgy
  (all 2.6.17* kernels there).

  I don't know if you need any further information here, because it
  seems this problem exists with nearly every new laptop and kernel or
  distribution, except the one used in edgy.

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