Comment 7 for bug 1630324

XPS-15 (9550), Yakkety, 4.8.0-41-generic, 40Mhz channels also unable to connect to Wifi any longer. Happy to provide testing or any additional information.

dmesg | grep brcm
[ 5.481593] usbcore: registered new interface driver brcmfmac
[ 5.481639] brcmfmac 0000:02:00.0: enabling device (0000 -> 0002)
[ 5.599437] brcmfmac 0000:02:00.0: Direct firmware load for brcm/brcmfmac43602-pcie.txt failed with error -2
[ 6.112535] brcmf_c_preinit_dcmds: Firmware version = wl0: Nov 10 2015 06:38:10 version 7.35.177.61 (r598657) FWID 01-ea662a8c
[ 6.167629] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 6.177287] brcmfmac 0000:02:00.0 wlp2s0: renamed from wlan0
[ 34.475342] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 38.568678] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 43.673001] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 242.690117] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 246.670201] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 248.314205] brcmf_cfg80211_escan: Connecting: status (3)
[ 248.314223] brcmf_cfg80211_scan: scan error (-11)
[ 251.619740] brcmf_inetaddr_changed: fail to get arp ip table err:-23
[ 251.675201] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 292.410333] brcmf_inetaddr_changed: fail to get arp ip table err:-23
[ 344.298222] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 396.312220] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 448.332129] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 482.471888] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 523.156863] brcmf_inetaddr_changed: fail to get arp ip table err:-23
[ 523.502468] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 527.549349] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)
[ 531.589616] brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)