I have also tested the backported kernel in Xenial, and the module builds and works well (as with 4.4).
uname -r 4.8.0-35-generic modinfo wl filename: /lib/modules/4.8.0-35-generic/updates/dkms/wl.ko license: MIXED/Proprietary srcversion: 0ADAE750C888A523D63D8B5 alias: pci:v*d*sv*sd*bc02sc80i* depends: cfg80211 vermagic: 4.8.0-35-generic SMP mod_unload modversions parm: passivemode:int parm: wl_txq_thresh:int parm: oneonly:int parm: piomode:int parm: instance_base:int parm: nompc:int parm: intf_name:string apt-cache policy linux-generic-hwe-16.04 linux-generic-hwe-16.04: Installed: 4.8.0.35.7 Candidate: 4.8.0.35.7 Version table: *** 4.8.0.35.7 400 400 http://it.archive.ubuntu.com/ubuntu xenial-proposed/main amd64 Packages 100 /var/lib/dpkg/status -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bcmwl in Ubuntu. https://bugs.launchpad.net/bugs/1647036 Title: Client does not ACK auth/assoc responses from Cisco AP3800 Status in bcmwl package in Ubuntu: Fix Released Status in bcmwl source package in Trusty: Fix Committed Status in bcmwl source package in Xenial: Fix Released Status in bcmwl source package in Yakkety: Fix Committed Status in bcmwl source package in Zesty: Fix Released Bug description: This client does not ACK Assoc Responses from a Cisco 3800. Traces attached. - Model: Dell XPS13 9343 - OS Version: Ubuntu 14.04.5 LTS - WNIC: Broadcom BCM4352 rev. 03 driver version 6.30.223.248 - SSID: user.wifi (WPA2/dot1x ) - MAC address: c4:8e:8f:f5:4a:7f -Cisco AP : 3800 (wave 2) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1647036/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp