1.  10.10 is no longer supported, nor 10.04.
2.  This is surely a hardware bug.  Some systems poorly isolate their 
electrical components, so leakage into the sound system is common.

** Changed in: bcmwl (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/651585

Title:
  Broadcom Corporation Device 4353 high pitch noise when CPU is idle

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