When I heard that Ubuntu could replace the wireless LAN router, I couldn't use the 5GHz band. The cause is the specification of the Linux driver iwlwifi for Intel chipsets. It seems that some of the atheros drivers can be used, but I haven't tried it.
Intel driver does not have 5GHz access point mode there were. Certainly, the introduced link says "AP mode on 2.4GHz (on devices driven by iwlmvm)" and says 5GHz. Unwritten. This means that the client mode supports 5GHz, but the access point mode does not support 5GHz.
Intel AC7265 page Compatible frequencies Since it is only written, is it a specification on the driver side rather than hardware?
Link on the above page
When I checked with iw list whether it was compatible with AP, it was compatible. I wondered if there was a difference in AP mode support between the 2.4GHz band and the 5GHz band, but it was an item common to both frequencies.
Answer about no IR flag Write something like Patch the kernel However, since it is a Debian story, at least it cannot be applied as it is. Even if it was possible, I didn't think I would analyze it and apply it.
It's better to buy a small WiFi router than to buy an external antenna (wireless adapter), so it's just a route to replace the built-in wireless LAN chip.
Some Qualcomm chip drivers are supported, but unfortunately the card with that chip is Mini PCI Express. Only, m.2 2230 compatible cards are not available at a reasonable price on Amazon.
When I was researching without giving up, I found a chip called Bointec DGF109A QCA6174A-5. A chip of .org / en / users / drivers / ath10k) is used, and if you look for it further, [MOUSER](https://www.mouser.jp/ProductDetail/AAEON-UP/RE-UPWFKITEX2TR?qs= It was sold at PqoDHHvF648qKGsGMqAlMQ% 3D% 3D).
MOUSER itself is not for consumers, but it looks like a company (I'm not sure). However, when I try to purchase, errors occur frequently on the purchase site, 4,118 yen + express fee of 2,000 yen, which is reasonably expensive, and since a 2.4 GHz band access point is required, it can only be operated exclusively with a 5 GHz band access point. If it was a specification, I gave up the order because it would be a wasteful investment even if it could be used at 5GHz.
The 5GHz band may be difficult for drivers to handle due to problems such as DFS.
2020/5/30: Draft 2020/6/20: First edition