[sadlywebdev]

A friend of mine had intermitent WiFi issues for a long time. One WiFi they could just never even find, until we figured out the Intel WiFi driver for their WiFi-Chipset contained a bug causing 2ghz WiFis on channel 13 to not be visible. It is a tiring process to identify issues like this in drivers. Really sucks when manufacturers just do not test their software.

[MayeulC]

Sounds like a misconfigured regulatory zone, TBH. Channels 12 and 13 are not legally usable in every country, including the USA: https://www.howtogeek.com/402142/why-wi-fi-channels-12-13-an...

[wil421]

That’s a feature for outdoor radios so they don’t interfere with airplane radars. Not sure why it was in a laptop. As the other poster said it’s for some non-US countries.

My APs have an outdoor mode I was curious about and turns out it’s for plane radars. I was very confused when I turned it on. They were outside APs so I turned it on. I was looking at the channel interfaces and noticed missing channels.

[antisthenes]

> WiFi-Chipset contained a bug causing 2ghz WiFis on channel 13 to not be visible.

Don't use non-standard channels. You're making it worse for everyone.

[jeroenhd]

Channels 12+ are perfectly valid for WiFi use in some jurisdictions. In fact, they're useful exactly because they mostly transmit outside the range of normal WiFi channels.

802.11n works perfectly fine with channels 1+5+9+13, letting the guard bands intersect. The 1/6/11 set common to the USA leaves plenty of guard space to prevent overlaps, but wastes bandwidth in jurisdictions where channel 12 and 13 are disallowed.