Hey there!
This is basically a follow-up to another thread I opened a while ago.
I have managed to get this card running after finding a recent post in the Ubuntu forum. 2.4GHz runs pretty good but there is no way to get a stable connection at 5GHz.
I read somewhere that the card needs to be set to match the region I am using it in which is Germany in my case. The P2P issue in my dmesg output, below is likely to be resolved by disabling WiFi direct.
May someone help me disabling P2P and set the correct region?
dmesg output:
[ +0,114453] brcmfmac 0000:02:00.0: Direct firmware load for brcm/brcmfmac4366c-pcie.txt failed with error -2
...
[ +0,399092] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Sep 12 2016 13:26:44 version 10.10.69.6908 (r658761) FWID 01-fed440e1
[ +0,009036] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ +0,040718] brcmfmac 0000:02:00.0 wlp2s0: renamed from wlan0
...
[ +4,695110] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ +0,018865] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ +0,510226] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ +0,494007] brcmfmac: brcmf_p2p_set_firmware: failed to update device address ret -23
[ +0,002739] brcmfmac: brcmf_p2p_create_p2pdev: set p2p_disc error
[ +0,002464] brcmfmac: brcmf_cfg80211_add_iface: add iface p2p-dev-wlp2s0 type 10 failed: err=-23
[ +0,014189] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ +0,268493] systemd-journald[687]: Failed to set ACL on /var/log/journal/27321d8138174adcaf35f46aff17c851/user-1000.journal, ignoring: Operation not supported
[ +1,009529] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ +0,580129] fuse init (API version 7.26)
[ +1,257844] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ +1,035645] brcmfmac: brcmf_inetaddr_changed: fail to get arp ip table err:-23