I'm seeing strange behavior with hw_mode=a and channel=any (full
config below) with runs of hostapd toggling between success and
failure.
I have a Atheros QCA6174 802.11ac card on Debian 10 with hostapd v2.8-devel.
The first run always results in failure:
Configuration file: /etc/hostapd/hostapd.conf
wlp4s0: interface state UNINITIALIZED->COUNTRY_UPDATE
ACS: Automatic channel selection started, this may take a bit
wlp4s0: interface state COUNTRY_UPDATE->ACS
wlp4s0: ACS-STARTED
ACS: Unable to collect survey data
ACS: All study options have failed
Interface initialization failed
wlp4s0: interface state ACS->DISABLED
wlp4s0: AP-DISABLED
ACS: Possibly channel configuration is invalid, please report this
along with your config file.
ACS: Failed to start
wlp4s0: AP-DISABLED
hostapd_free_hapd_data: Interface wlp4s0 wasn't started
nl80211: deinit ifname=wlp4s0 disabled_11b_rates=0
wlp4s0: interface state DISABLED->DISABLED
wlp4s0: interface state DISABLED->DISABLED
wlp4s0: AP-DISABLED
wlp4s0: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface wlp4s0 wasn't started
With a second run always succeeding with:
Configuration file: /etc/hostapd/hostapd.conf
wlp4s0: interface state UNINITIALIZED->COUNTRY_UPDATE
ACS: Automatic channel selection started, this may take a bit
wlp4s0: interface state COUNTRY_UPDATE->ACS
wlp4s0: ACS-STARTED
wlp4s0: ACS-COMPLETED freq=5180 channel=36
Using interface wlp4s0 with hwaddr 00:0e:8e:90:40:f9 and ssid "RRC_TEST"
wlp4s0: interface state ACS->ENABLED
wlp4s0: AP-ENABLED
(I successfully connect)
^C
wlp4s0: interface state ENABLED->DISABLED
wlp4s0: AP-DISABLED
wlp4s0: CTRL-EVENT-TERMINATING
nl80211: deinit ifname=wlp4s0 disabled_11b_rates=0
with the above repeating indefinitely for all subsequent runs. My
config file is:
#### Interface configuration ####
interface=wlp4s0
bridge=br0
driver=nl80211
##### IEEE 802.11 related configuration #####
ssid=RRC_TEST
hw_mode=a
channel=0
auth_algs=1
wmm_enabled=1
country_code=CZ
ieee80211d=1
ieee80211h=0
##### IEEE 802.11n related configuration #####
ieee80211n=1
#require_ht=1
##### IEEE 802.11ac related configuration #####
ieee80211ac=1
#require_vht=1
#vht_oper_chwidth=1
#vht_oper_centr_freq_seg0_idx=42
##### WPA/IEEE 802.11i configuration #####
wpa=2
wpa_key_mgmt=WPA-PSK
rsn_pairwise=CCMP
wpa_passphrase=foobarbaz
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