The broadcom release notes mentiones
KNOWN ISSUES AND LIMITATIONS
----------------------------
#72238 - 20% lower throughput on channels 149, 153, 157, and 161
#76743 - Ubuntu9.04: Network manager displays n/w's with radio disabled
#76793 - Ubuntu9.04: STA fails to create IBSS network in 5 Ghz band
#81392 - Unable to transfer data over ad-hoc network created by NetworkManager 
(iwconfig OK)
#81452 - STA unable to associate to AP when PEAPv1-MSCHAPv2 authentication is 
used

Tried to find more about #76743 but did not succeed

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[Lucid] Network Manager Applet Wi-Fi icon always shows red exclamation mark
https://bugs.launchpad.net/bugs/539300
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