Bug 21222 - Bluetooth high pitch noise Broadcom 4353
Summary: Bluetooth high pitch noise Broadcom 4353
Status: RESOLVED DUPLICATE of bug 25532
Alias: None
Product: Networking
Classification: Unclassified
Component: Other (show other bugs)
Hardware: All Linux
: P1 high
Assignee: Arnaldo Carvalho de Melo
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-10-26 21:47 UTC by Louis
Modified: 2010-12-23 10:35 UTC (History)
2 users (show)

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Regression: No
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Description Louis 2010-10-26 21:47:32 UTC 
The bluetooth card of HP Envy 17, Broadcom coorporation 4353 (wifi+bluetooth) emits an intermittent high pitch noise, amplified when the CPU is idle, when the bluetooth kernel module is activated.

On Windows 7 it doesn't produce any kind of noise. 
Deactivating bluetooth kernel module removes the noise.
Maybe a circuit resonance generated by a wrong bluetooth search frequency/alimentation? 

Tested on kernels 2.6.34 and 2.6.35.
Comment 1 Louis 2010-11-09 19:17:17 UTC 
This issue starts when module btusb is enabled.
Could you please set component: driver->bluetooth. Thanks.
Comment 2 Louis 2010-12-23 10:35:18 UTC 

*** This bug has been marked as a duplicate of bug 25532 ***
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