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root# rfkill list
0: phy0: wlan
Soft blocked: no
Hard blocked: no
Running rfkill list got the same result as before.
Interestingly, 'f2' and 'f3' have brightness icons and work to adjust brightness without holding down the 'fn' key. this is also true for 'f5', which launches a browser.
Pressing 'f12' on its own seems to do nothing. My experimenting with 'f*' keys hasn't located one that will turn off the wifi.