Bug 21222

Summary:	Bluetooth high pitch noise Broadcom 4353
Product:	Networking	Reporter:	Louis (lixo1)
Component:	Other	Assignee:	Arnaldo Carvalho de Melo (acme)
Status:	RESOLVED DUPLICATE
Severity:	high	CC:	drivers_bluetooth, lixo1
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:

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 ***