For your info, from the mighty Arch wiki -
https://wiki.archlinux.org/index.php/Dell_Studio_1555
Networking
Ethernet works out of the box. Wireless may work out of the box depending on your wifi card. If you have a Broadcom BCM43XX card, you will need to install the broadcom-wl driver from the AUR. Read Broadcom wireless guide for details. b43 driver can work as well, if supplied with proper firmware.