Dave's comment above fixed my problem. I have an Acer 2483 TravelMate
laptop with an Atheros wireless chipset.
Before I added the "options" line above to /etc/modprobe.d/options (and
re-booted), my wifi only saw 11 channels. But now it sees 13.
st...@steve-laptop:~$ iwlist wlan0 channel
wlan0 13 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Current Frequency=2.472 GHz (Channel 13)
My AP is on Channel 13 and was not visible prior to this change. Now, I
can connect to the same AP with no problems (D-Link DI-624S set to
"auto" with respect to channels).
--
Intel 4965 wireless can't see wifi channels 12 and 13
https://bugs.launchpad.net/bugs/275279
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