Hi guys, today i wanted to setup an access point on my Raspberry Pi 3 A+ (BCM43455). Unfortunately the hostapd 2.4 shipped with Raspbian failed with recent Linux kernel: rfkill: initial event: idx=0 type=2 op=0 soft=0 hard=0 rfkill: initial event: idx=1 type=1 op=0 soft=0 hard=0 nl80211: Using driver-based roaming nl80211: TDLS supported nl80211: Supported cipher 00-0f-ac:1 nl80211: Supported cipher 00-0f-ac:5 nl80211: Supported cipher 00-0f-ac:2 nl80211: Supported cipher 00-0f-ac:4 nl80211: Supported cipher 00-0f-ac:6 nl80211: Using driver-based off-channel TX nl80211: Supported vendor command: vendor_id=0x1018 subcmd=1 nl80211: Use separate P2P group interface (driver advertised support) nl80211: Enable multi-channel concurrent (driver advertised support) nl80211: use P2P_DEVICE support nl80211: Disable use_monitor with device_ap_sme since no monitor mode support detected nl80211: interface wlan0 in phy phy0 nl80211: Set mode ifindex 3 iftype 3 (AP) nl80211: Setup AP(wlan0) - device_ap_sme=1 use_monitor=0 nl80211: Subscribe to mgmt frames with AP handle 0x114350 (device SME) nl80211: Register frame type=0xd0 (WLAN_FC_STYPE_ACTION) nl_handle=0x114350 match= nl80211: Register frame command failed (type=208): ret=-22 (Invalid argument) nl80211: Register frame match - hexdump(len=0): [NULL] nl80211: Could not configure driver mode nl80211: deinit ifname=wlan0 disabled_11b_rates=0 nl80211: Remove monitor interface: refcount=0 nl80211: Remove beacon (ifindex=3) netlink: Operstate: ifindex=3 linkmode=0 (kernel-control), operstate=6 (IF_OPER_UP) nl80211: Set mode ifindex 3 iftype 2 (STATION) nl80211: Teardown AP(wlan0) - device_ap_sme=1 use_monitor=0 nl80211 driver initialization failed. I was able to bisect this issue down to this commit: 1204aa17f3b4 ("brcmfmac: set WIPHY_FLAG_HAVE_AP_SME flag") After reverting this commit hostapd works as expected. Best regards Stefan