lspci -k shows
Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev01) the AUR driver will work.
See Broadcom wireless.
rfkill list all shows your wireless as Hard blocked and the wireless button does not work a restore factory defaults in BIOS will remove the hard block.
CPU Frequency Scaling
See the main CPU frequency scaling article.
Sound and Headphones
If the speakers are not muted when headphones are plugged in, add this line to
options snd-hda-intel model=laptop