I have a similar issue with Mac Book Pro 15", with only one of my two base stations, the other one seems to work fine.
The base station that fails is a Freebox Revolution, configured to use channels 12 and 8 with 40MHz bandwidth in 2.4GHz mode (according to its configuration page). The base station that works (same SSID, same password) is an old Airport Time Capsule. When I attempt to connect to the Freebox Revolution, I get a stack trace: [ 1008.652836] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) [ 1011.548069] ------------[ cut here ]------------ [ 1011.548099] WARNING: CPU: 2 PID: 2262 at net/wireless/sme.c:724 __cfg80211_connect_result+0x3ab/0x410 [cfg80211] [ 1011.548100] Modules linked in: rfcomm fuse nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_mangle ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_raw ip6table_security iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_raw iptable_security ebtable_filter ebtables ip6table_filter ip6_tables cmac bnep nls_utf8 hfsplus intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel btusb snd_hda_codec_cirrus snd_hda_codec_generic snd_hda_codec_hdmi brcmfmac kvm btrtl btbcm btintel joydev bluetooth brcmutil snd_hda_intel snd_hda_codec applesmc cfg80211 iTCO_wdt irqbypass iTCO_vendor_support input_polldev [ 1011.548128] snd_hda_core crct10dif_pclmul mmc_core crc32_pclmul snd_hwdep snd_seq ghash_clmulni_intel intel_cstate intel_uncore mei_me intel_rapl_perf bcm5974 snd_seq_device rfkill mei i2c_i801 snd_pcm i2c_smbus lpc_ich thunderbolt snd_timer snd soundcore shpchp sbs sbshc acpi_als apple_gmux kfifo_buf industrialio video tpm_tis tpm_tis_core tpm apple_bl nfsd auth_rpcgss nfs_acl lockd grace sunrpc uas usb_storage hid_apple btrfs xor amdkfd amd_iommu_v2 radeon raid6_pq i2c_algo_bit drm_kms_helper ttm crc32c_intel drm fjes [ 1011.548154] CPU: 2 PID: 2262 Comm: kworker/u16:9 Tainted: G W 4.8.14-300.fc25.x86_64 #1 [ 1011.548155] Hardware name: Apple Inc. MacBookPro11,5/Mac-06F11F11946D27C5, BIOS MBP114.88Z.0172.B09.1602151732 02/15/2016 [ 1011.548164] Workqueue: cfg80211 cfg80211_event_work [cfg80211] [ 1011.548165] 0000000000000286 00000000650b1753 ffff92b31fe0fc98 ffffffff823e5ded [ 1011.548167] 0000000000000000 0000000000000000 ffff92b31fe0fcd8 ffffffff820a0e8b [ 1011.548169] 000002d400000008 ffff92b36aa9c008 0000000000000000 ffff92b36aa9b000 [ 1011.548171] Call Trace: [ 1011.548175] [] dump_stack+0x63/0x86 [ 1011.548178] [] __warn+0xcb/0xf0 [ 1011.548180] [] warn_slowpath_null+0x1d/0x20 [ 1011.548190] [] __cfg80211_connect_result+0x3ab/0x410 [cfg80211] [ 1011.548199] [] cfg80211_process_wdev_events+0x129/0x1a0 [cfg80211] [ 1011.548207] [] cfg80211_process_rdev_events+0x38/0x70 [cfg80211] [ 1011.548215] [] cfg80211_event_work+0x1e/0x30 [cfg80211] [ 1011.548217] [] process_one_work+0x184/0x430 [ 1011.548218] [] worker_thread+0x4e/0x480 [ 1011.548219] [] ? process_one_work+0x430/0x430 [ 1011.548220] [] ? process_one_work+0x430/0x430 [ 1011.548222] [] kthread+0xd8/0xf0 [ 1011.548226] [] ret_from_fork+0x1f/0x40 [ 1011.548228] [] ? kthread_worker_fn+0x180/0x180 [ 1011.548229] ---[ end trace 022b2d25dbb9a245 ]-- ** Bug watch added: Linux Kernel Bug Tracker #103201 http://bugzilla.kernel.org/show_bug.cgi?id=103201 ** Also affects: linux (Fedora) via http://bugzilla.kernel.org/show_bug.cgi?id=103201 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1630324 Title: Broadcom wifi dies in 60s cycles with 4.8 kernel Status in linux package in Ubuntu: Confirmed Status in linux package in Fedora: Unknown Bug description: I have a Dell XPS 13 9350 with a Broadcom wifi adapter. Wifi connects fine, but dies for around 5-10s (the signal dies completely, tools like wavemon show "no interface data") in regular cycles of about 60s. dmesg logs the same brcmfmac errors every minute or so: "brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)". network-manager's icon doesn't change however (remains as if the adapter was connected). This issue started to affect me when using kernel 4.8 on Ubuntu 16.04. I previously used kernel 4.7 and did not experience this bug. I booted the 16.10 daily build and experienced exactly the same errors. $ lspci | grep BCM4350 3a:00.0 Network controller: Broadcom Limited BCM4350 802.11ac Wireless Network Adapter (rev 08) $ dmesg | grep brcm [ 5.864558] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Oct 22 2015 06:16:26 version 7.35.180.119 (r594535) FWID 01-e791c176 [ 5.898803] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) [ 74.991987] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) [ 142.503220] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30) ... $ lsb_release -rd Description: Ubuntu 16.04.1 LTS Release: 16.04 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: network-manager 1.1.93-0ubuntu4 Uname: Linux 4.8.0-040800-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 CurrentDesktop: Unity Date: Tue Oct 4 14:15:02 2016 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2016-05-26 (131 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) IpRoute: default via 192.168.0.1 dev wlp58s0 proto static metric 600 169.254.0.0/16 dev wlp58s0 scope link metric 1000 192.168.0.0/24 dev wlp58s0 proto kernel scope link src 192.168.0.29 metric 600 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true SourcePackage: network-manager UpgradeStatus: No upgrade log present (probably fresh install) nmcli-dev: DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH wlp58s0 wifi connected /org/freedesktop/NetworkManager/Devices/0 Guava Guest 1 68ae8dc2-ab23-42ef-9e41-ac8e9d91385a /org/freedesktop/NetworkManager/ActiveConnection/0 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- -- nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'. 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