I have a Dell Vostro 3300 which I use as a dual-boot.
All the LEDs work perfectly fine on Windows 7 but the Wi-Fi LED does not work on Ubuntu 11.10. There is a Bluetooth LED which works perfectly fine.
I tried installing the proprietary Broadcom wireless driver, it did not help either.
Vostro-3300:~$ lspci -vnn | grep 14e4 12:00.0 Network controller : Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
and the second output is :
lsmod | grep brcmsmac brcmsmac 631693 0 brcmutil 17837 1 brcmsmac mac80211 310872 1 brcmsmac cfg80211 199587 2 brcmsmac,mac80211 crc_ccitt 12667 1 brcmsmac