psyborg:

Supply the following if possible:

• Archer C7 v1
• r11895-fba8083
• set country to US or world, enable 5ghz wifi with 80mhz bw

card is falling back to VHT20 mode, and no channel/country config change from interface helps to get it started at VHT80.
confirmed using QCA9880 v1 card that comes with CR regdomain burned in by default, and is likely present with cards coming with several other regdomains in eeprom.
hardcoding null value for regdomain in ath10k driver allows it to get detected as US region card in which case VHT80 starts as expected

log output:

Wed Jan 15 10:05:22 2020 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Wed Jan 15 10:05:23 2020 daemon.err hostapd: HT40 secondary channel 40 not allowed
Wed Jan 15 10:05:23 2020 daemon.notice hostapd: Fallback to 20 MHz
Wed Jan 15 10:05:23 2020 daemon.err hostapd: Using interface wlan0 with hwaddr 10:fe:ed:eb:f0:5f and ssid "OpenWrt55"

it is expected that once different country is set from config, its limits will take effect without old/default country values interference