I have an Linux system with QCA9882 wifi carad adapter that runs wifi AP using
hostapd. I've configured
hostapd to use vht capabilities and enabled 80Mhz channel bandwidth. In general AP works but clients connects using 20Mhz channel bandwidth.
In particular my 2018 macbook pro connects to point, and after connection indicator shows that it switches between 20Mhz and 80Mhz for some time then stops on 20Mhz.
RSSI/Noize on client is -47dBm/-97dBm, there is no other visible 5Ghz stations.
How can I find out why clients can't use 80mhz?
UPD1: I did some test and find out that in my country (RU) I can run 80Mhz bandwidth access point only on 3 channels:
- 36 (with center on 42/5210Mhz)
- 149 (with center on 155/5775Mhz)
- 153 (with center on 159/5795Mhz)
when running AP on 36 or 149 connected client use 80Mhz channel, but in case of 153 channel client prefer 20Mhz channel for some reason.