Created attachment 798640 [details]
my hostapd configuration

Since a recent software update (with zypper up, at the end of February),
hostapd is unable to set up a 5GHz WiFi access point.
I have attached my hostapd.conf file, the one that produces this error, as well
as a diff of my changes relative to a pristine hostapd.conf file.

A temporary work-around is to change the country code from CH (Switzerland) to
FR (France) or DE (Germany) - both work for me.

Earlier, when it worked, hostapd produced log entries like this when starting:

Feb 20 16:19:55 winti systemd[1]: Started Hostapd IEEE 802.11 AP, IEEE
802.1X/WPA/WPA2/EAP/RADIUS Authenticator.
Feb 20 16:19:55 winti hostapd[2387]: Configuration file: /etc/hostapd.conf
Feb 20 16:19:55 winti hostapd[2387]: wlan0: interface state
UNINITIALIZED->COUNTRY_UPDATE
Feb 20 16:19:55 winti hostapd[2387]: ACS: Automatic channel selection started,
this may take a bit
Feb 20 16:19:55 winti hostapd[2387]: wlan0: interface state COUNTRY_UPDATE->ACS
Feb 20 16:19:55 winti hostapd[2387]: wlan0: ACS-STARTED
Feb 20 16:19:57 winti hostapd[2387]: wlan0: ACS-COMPLETED freq=5220 channel=44
Feb 20 16:19:57 winti hostapd[2387]: Using interface wlan0 with hwaddr
04:f0:21:17:3d:a4 and ssid "luftnetz"
Feb 20 16:19:57 winti hostapd[2387]: wlan0: interface state ACS->ENABLED
Feb 20 16:19:57 winti hostapd[2387]: wlan0: AP-ENABLED

Now it looks like this:

Mar 01 00:26:55 winti systemd[1]: Started Hostapd IEEE 802.11 AP, IEEE
802.1X/WPA/WPA2/EAP/RADIUS Authenticator.
Mar 01 00:26:55 winti hostapd[1509]: Configuration file: /etc/hostapd.conf
Mar 01 00:26:55 winti hostapd[1509]: wlan0: interface state
UNINITIALIZED->COUNTRY_UPDATE
Mar 01 00:26:55 winti hostapd[1509]: ACS: Automatic channel selection started,
this may take a bit
Mar 01 00:26:55 winti hostapd[1509]: wlan0: interface state COUNTRY_UPDATE->ACS
Mar 01 00:26:55 winti hostapd[1509]: wlan0: ACS-STARTED
Mar 01 00:27:12 winti hostapd[1509]: ACS: Unable to collect survey data
Mar 01 00:27:12 winti hostapd[1509]: ACS: All study options have failed
Mar 01 00:27:12 winti hostapd[1509]: Interface initialization failed
Mar 01 00:27:12 winti hostapd[1509]: wlan0: interface state ACS->DISABLED
Mar 01 00:27:12 winti hostapd[1509]: wlan0: AP-DISABLED
Mar 01 00:27:12 winti hostapd[1509]: ACS: Possibly channel configuration is
invalid, please report this along with your config file.
Mar 01 00:27:12 winti hostapd[1509]: ACS: Failed to start
Mar 01 00:27:12 winti hostapd[1509]: wlan0: AP-DISABLED
Mar 01 00:27:12 winti hostapd[1509]: hostapd_free_hapd_data: Interface wlan0
wasn't started
Mar 01 00:27:12 winti hostapd[1509]: nl80211: deinit ifname=wlan0
disabled_11b_rates=0
Mar 01 00:27:13 winti hostapd[1509]: wlan0: interface state DISABLED->DISABLED
Mar 01 00:27:13 winti hostapd[1509]: wlan0: interface state DISABLED->DISABLED
Mar 01 00:27:13 winti hostapd[1509]: wlan0: AP-DISABLED
Mar 01 00:27:13 winti hostapd[1509]: hostapd_free_hapd_data: Interface wlan0
wasn't started