O lsmod apresenta o resultado abaixo, mas não lista a broadcom:
Module Size Used by vfat 15809 1 fat 51037 1 vfat orinoco_cs 19781 1 orinoco 40277 1 orinoco_cs hermes 11073 2 orinoco_cs,orinoco autofs4 23749 2 hidp 23105 2 rfcomm 42457 0 l2cap 29633 10 hidp,rfcomm bluetooth 53925 5 hidp,rfcomm,l2cap sunrpc 142973 1 ip_conntrack_ftp 11697 0 ip_conntrack_netbios_ns 6977 0 ipt_REJECT 9537 1 xt_state 6209 11 ip_conntrack 53153 3 ip_conntrack_ftp,ip_conntrack_netbios_ns,xt_state nfnetlink 10713 1 ip_conntrack iptable_filter 7105 1 ip_tables 17029 1 iptable_filter ip6t_REJECT 9409 1 xt_tcpudp 7105 28 ip6table_filter 6849 1 ip6_tables 18181 1 ip6table_filter x_tables 17349 6 ipt_REJECT,xt_state,ip_tables,ip6t_REJECT,xt_tcpudp,ip6_tables cpufreq_ondemand 10573 1 dm_mirror 29713 0 dm_mod 56665 1 dm_mirror video 19269 0 sbs 18533 0 i2c_ec 9025 1 sbs button 10705 0 battery 13637 0 asus_acpi 19289 0 ac 9157 0 ipv6 250369 21 ip6t_REJECT parport_pc 29157 0 lp 15849 0 parport 37513 2 parport_pc,lp joydev 13185 0 snd_hda_intel 21333 1 snd_hda_codec 144321 1 snd_hda_intel snd_seq_dummy 7877 0 snd_seq_oss 32705 0 snd_seq_midi_event 11073 1 snd_seq_oss snd_seq 49841 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi_event snd_seq_device 11853 3 snd_seq_dummy,snd_seq_oss,snd_seq snd_pcm_oss 42849 0 sg 35933 0 snd_mixer_oss 19137 1 snd_pcm_oss snd_pcm 71621 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss pcspkr 7105 0 snd_timer 24901 2 snd_seq,snd_pcm snd 51909 11 snd_hda_intel,snd_hda_codec,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer soundcore 13217 1 snd snd_page_alloc 13641 2 snd_hda_intel,snd_pcm i2c_piix4 12109 0 i2c_core 23745 2 i2c_ec,i2c_piix4 8139too 28737 0 ide_cd 40033 1 k8_edac 17537 0 8139cp 26305 0 cdrom 36705 1 ide_cd edac_mc 24977 1 k8_edac mii 9409 2 8139too,8139cp sdhci 21337 0 mmc_core 27457 1 sdhci serio_raw 10693 0 usb_storage 76193 1 sata_sil 15305 4 libata 96857 1 sata_sil sd_mod 22977 7 scsi_mod 130637 4 sg,usb_storage,libata,sd_mod ext3 123081 3 jbd 56553 1 ext3 ehci_hcd 32845 0 ohci_hcd 23261 0 uhci_hcd 25421 0
?
De um "lsmod" e poste a saída. Acho que nome do módulo que eu te passei ta errado, acredito que o certo é o bcm43xx.
Renan.