When i try to bring up the 3rd band with "auto" settings (auto power, auto channel), following is happening:
Thu May 30 09:11:09 2019 daemon.notice netifd: radio0 (14630): command failed: Not supported (-95)
Thu May 30 09:11:09 2019 user.notice mac80211: Failed command: iw phy phy0 set distance 0
Thu May 30 09:11:09 2019 daemon.notice netifd: radio0 (14630): sh: out of range
Thu May 30 09:11:10 2019 daemon.err hostapd: Configuration file: /var/run/hostapd-phy0.conf
Thu May 30 09:11:12 2019 kern.warn kernel: [46924.726337] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
Thu May 30 09:11:12 2019 kern.warn kernel: [46924.726392] ath10k_pci 0000:01:00.0: msdu-desc: 2500 skid: 32
Thu May 30 09:11:12 2019 kern.info kernel: [46924.780928] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
Thu May 30 09:11:12 2019 kern.info kernel: [46924.782192] ath10k_pci 0000:01:00.0: wmi print 'free: 117936 iram: 22500 sram: 29708'
Thu May 30 09:11:12 2019 daemon.notice hostapd: wlan0: INTERFACE-ENABLED
Thu May 30 09:11:12 2019 kern.warn kernel: [46925.092157] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Thu May 30 09:11:12 2019 kern.warn kernel: [46925.110398] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Thu May 30 09:11:12 2019 daemon.notice hostapd: wlan0: INTERFACE-DISABLED
Thu May 30 09:11:12 2019 daemon.err hostapd: nl80211: Could not configure driver mode
Thu May 30 09:11:12 2019 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Thu May 30 09:11:12 2019 daemon.err hostapd: nl80211 driver initialization failed.
Thu May 30 09:11:12 2019 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->DISABLED
Thu May 30 09:11:12 2019 daemon.notice hostapd: wlan0: AP-DISABLED
Thu May 30 09:11:12 2019 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Thu May 30 09:11:12 2019 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Thu May 30 09:11:12 2019 daemon.notice netifd: radio0 (14630): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 2315 path ()
Thu May 30 09:11:12 2019 daemon.notice netifd: radio0 (14630): Device setup failed: HOSTAPD_START_FAILED
When i start it with a fixed channel value (channel 157) and power on auto:
Thu May 30 09:13:33 2019 daemon.notice netifd: radio0 (15792): command failed: Not supported (-95)
Thu May 30 09:13:33 2019 user.notice mac80211: Failed command: iw phy phy0 set distance 0
Thu May 30 09:13:33 2019 daemon.notice netifd: radio0 (15792): sh: out of range
Thu May 30 09:13:33 2019 daemon.err hostapd: Configuration file: /var/run/hostapd-phy0.conf
Thu May 30 09:13:35 2019 kern.warn kernel: [47067.994929] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
Thu May 30 09:13:35 2019 kern.warn kernel: [47067.994981] ath10k_pci 0000:01:00.0: msdu-desc: 2500 skid: 32
Thu May 30 09:13:35 2019 kern.info kernel: [47068.049452] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
Thu May 30 09:13:35 2019 kern.info kernel: [47068.051020] ath10k_pci 0000:01:00.0: wmi print 'free: 117936 iram: 22500 sram: 29708'
Thu May 30 09:13:35 2019 kern.warn kernel: [47068.360109] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Thu May 30 09:13:35 2019 daemon.notice hostapd: wlan0: INTERFACE-ENABLED
Thu May 30 09:13:35 2019 kern.warn kernel: [47068.374833] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Thu May 30 09:13:35 2019 daemon.notice hostapd: wlan0: INTERFACE-DISABLED
Thu May 30 09:13:35 2019 daemon.err hostapd: nl80211: Could not configure driver mode
Thu May 30 09:13:35 2019 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Thu May 30 09:13:35 2019 daemon.err hostapd: nl80211 driver initialization failed.
Thu May 30 09:13:35 2019 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->DISABLED
Thu May 30 09:13:35 2019 daemon.notice hostapd: wlan0: AP-DISABLED
Thu May 30 09:13:35 2019 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Thu May 30 09:13:35 2019 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Thu May 30 09:13:35 2019 daemon.notice netifd: radio0 (15792): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 2315 path ()
Thu May 30 09:13:36 2019 daemon.notice netifd: radio0 (15792): Device setup failed: HOSTAPD_START_FAILED
When i start it with both values fixed (channel 157, power 13 dbm (max)):
Thu May 30 09:17:15 2019 daemon.notice netifd: radio0 (17188): command failed: Not supported (-95)
Thu May 30 09:17:15 2019 user.notice mac80211: Failed command: iw phy phy0 set distance 0
Thu May 30 09:17:15 2019 daemon.notice netifd: radio0 (17188): sh: out of range
Thu May 30 09:17:16 2019 daemon.err hostapd: Configuration file: /var/run/hostapd-phy0.conf
Thu May 30 09:17:18 2019 kern.warn kernel: [47290.777939] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16 peers: 48 tid: 96
Thu May 30 09:17:18 2019 kern.warn kernel: [47290.777984] ath10k_pci 0000:01:00.0: msdu-desc: 2500 skid: 32
Thu May 30 09:17:18 2019 kern.info kernel: [47290.832445] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186 msdu-desc: 2500 sw-crypt: 0 ct-sta: 0'
Thu May 30 09:17:18 2019 kern.info kernel: [47290.834756] ath10k_pci 0000:01:00.0: wmi print 'free: 117936 iram: 22500 sram: 29708'
Thu May 30 09:17:18 2019 daemon.notice hostapd: wlan0: INTERFACE-ENABLED
Thu May 30 09:17:18 2019 kern.warn kernel: [47291.146624] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Thu May 30 09:17:18 2019 kern.warn kernel: [47291.148729] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Thu May 30 09:17:18 2019 daemon.err hostapd: nl80211: Could not configure driver mode
Thu May 30 09:17:18 2019 daemon.notice hostapd: wlan0: INTERFACE-DISABLED
Thu May 30 09:17:18 2019 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Thu May 30 09:17:18 2019 daemon.err hostapd: nl80211 driver initialization failed.
Thu May 30 09:17:18 2019 daemon.notice hostapd: wlan0: interface state UNINITIALIZED->DISABLED
Thu May 30 09:17:18 2019 daemon.notice hostapd: wlan0: AP-DISABLED
Thu May 30 09:17:18 2019 daemon.notice hostapd: wlan0: CTRL-EVENT-TERMINATING
Thu May 30 09:17:18 2019 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Thu May 30 09:17:18 2019 daemon.notice netifd: radio0 (17188): WARNING (wireless_add_process): executable path /usr/sbin/wpad does not match process 2315 path ()
Thu May 30 09:17:18 2019 daemon.notice netifd: radio0 (17188): Device setup failed: HOSTAPD_START_FAILED
Does that help you in any way?