OpenWRT 18.06.02 hasn't improved the 160MHz situation.
The regulatory db has the correct info, but setting 160MHz in luci causes hostapd to not bring up the adapter. Setting to the AU country code doesn't work either.
<pre>phy#0
country US: DFS-FCC
(2402 - 2472 @ 40), (N/A, 30), (N/A)
(5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5330 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5490 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5735 - 5835 @ 80), (N/A, 30), (N/A)
(57240 - 63720 @ 2160), (N/A, 40), (N/A)</pre>
<pre>Sat Mar 23 16:10:35 2019 daemon.err hostapd: Configuration file: /var/run/hostapd-phy0.conf
Sat Mar 23 16:10:42 2019 kern.warn kernel: [977907.692948] ath10k_pci 0000:01:00.0: Unknown eventid: 36933
Sat Mar 23 16:10:42 2019 kern.info kernel: [977907.696105] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Sat Mar 23 16:10:42 2019 kern.info kernel: [977907.702019] br-lan: port 3(wlan0) entered blocking state
Sat Mar 23 16:10:42 2019 kern.info kernel: [977907.703667] br-lan: port 3(wlan0) entered disabled state
Sat Mar 23 16:10:42 2019 kern.info kernel: [977907.709154] device wlan0 entered promiscuous mode
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->COUNTRY_UPDATE
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: interface state HT_SCAN->DFS
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5500 chan=100 sec_chan=1, width=2, seg0=114, seg1=0, cac_time=60s
Sat Mar 23 16:10:42 2019 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Sat Mar 23 16:10:42 2019 daemon.err hostapd: Interface initialization failed
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: interface state DFS->DISABLED
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: AP-DISABLED
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: interface state DISABLED->DISABLED
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: AP-DISABLED
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Sat Mar 23 16:10:42 2019 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Sat Mar 23 16:10:42 2019 kern.info kernel: [977908.071830] device wlan0 left promiscuous mode
Sat Mar 23 16:10:42 2019 kern.info kernel: [977908.071925] br-lan: port 3(wlan0) entered disabled state
Sat Mar 23 16:10:42 2019 kern.warn kernel: [977908.112339] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 1
Sat Mar 23 16:10:42 2019 daemon.notice hostapd: ELOOP: remaining socket: sock=22 eloop_data=0xb6f73aa0 user_data=0 handler=0x42314
Sat Mar 23 16:10:42 2019 daemon.notice netifd: radio0 (15765): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 1400 path ()</pre>