Hi,
after some tracing, it seems to BSS_CHANGED_BSSID flag is never set and we never
call b43_update_templates.
Removing the changed & BSS_CHANGED_BSSID check (from [1]) make the beacon work
Matthieu
[1]
http://git.kernel.org/?p=linux/kernel/git/linville/wireless-next-2.6.git;a=commitdiff;h=2d0ddec5b2b859f06116f631fc0ffe94fbceb556