Dell XPS 13 running Ubuntu 14.04 - Wifi not working since recent update

wireless-info results below:

any help would be much appreciated

########## wireless info START ##########

Report from: 21 Jul 2016 08:38 BST +0100

Booted last: 20 Jul 2016 11:39 BST +0100

Script from: 08 Jul 2016 02:16 UTC +0000

##### release ###########################

Distributor ID: Ubuntu
Description: Ubuntu 14.04.4 LTS
Release: 14.04
Codename: trusty

##### keel ############################

Linux 3.19.0-65-generic #73~14.04.1-Ubuntu SMP Wed Jun 29 21:05:22 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Parameters: ro, quiet, splash, vt.handoff=7

##### desktop ###########################

Cinnamon

##### lspci #############################

3a:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
Subsystem: Intel Corporation Device [8086:0050]

3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device [10ec:525a] (rev 01)

##### lsusb #############################

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 1fc9:5002 NXP Semiconductors
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 0b95:1790 ASIX Electronics Corp. AX88179 Gigabit Etheet
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 0c45:670c Microdia
Bus 001 Device 004: ID 04f3:20d0 Elan Microelectronics Corp.
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

##### PCMCIA card info ##################

##### rfkill ############################

##### lsmod #############################

dell_wmi 16384 0
sparse_keymap 16384 1 dell_wmi
dell_laptop 16384 0
dcdbas 16384 1 dell_laptop
wmi 20480 1 dell_wmi

##### interfaces ########################

auto lo
iface lo inet loopback

##### ifconfig ##########################

br-860441bdf0a3 Link encap:Etheet HWaddr <MAC 'br-860441bdf0a3' [IF1]>
inet addr:172.18.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

br-bd9e9ee0ec19 Link encap:Etheet HWaddr <MAC 'br-bd9e9ee0ec19' [IF2]>
inet addr:172.19.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

docker0 Link encap:Etheet HWaddr <MAC 'docker0' [IF3]>
inet addr:172.17.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::<IP6 'docker0' [IF3]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:79 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:536 (536.0 B) TX bytes:9764 (9.7 KB)

eth0 Link encap:Etheet HWaddr <MAC 'eth0' [IF4]>
inet addr:192.168.0.111 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::<IP6 'eth0' [IF4]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:445642 errors:0 dropped:0 overruns:0 frame:0
TX packets:210656 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:271924464 (271.9 MB) TX bytes:36404808 (36.4 MB)

veth9cfda22 Link encap:Etheet HWaddr <MAC 'veth9cfda22' [IF5]>
inet6 addr: fe80::<IP6 'veth9cfda22' [IF5]>/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:130 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:648 (648.0 B) TX bytes:16485 (16.4 KB)

##### iwconfig ##########################

lo no wireless extensions.

br-bd9e9ee0ec19 no wireless extensions.

br-860441bdf0a3 no wireless extensions.

veth9cfda22 no wireless extensions.

docker0 no wireless extensions.

eth0 no wireless extensions.

##### route #############################

Keel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
172.17.0.0 0.0.0.0 255.255.0.0 U 0 0 0 docker0
172.18.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-860441bdf0a3
172.19.0.0 0.0.0.0 255.255.0.0 U 0 0 0 br-bd9e9ee0ec19
192.168.0.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0

##### resolv.conf #######################

nameserver 127.0.1.1
search yoyowallet.net

##### network managers ##################

Installed:

NetworkManager

Running:

root 919 1 0 Jul20 ? 00:00:01 NetworkManager

##### NetworkManager info ###############

NetworkManager Tool

State: connected (global)

- Device: eth0 [Wired connection 1] -------------------------------------------
Type: Wired
Driver: ax88179_178a
State: connected
Default: yes
HW Address: <MAC 'eth0' [IF4]>

Capabilities:
Carrier Detect: yes
Speed: 1000 Mb/s

Wired Properties
Carrier: on

IPv4 Settings:
Address: 192.168.0.111
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1

DNS: 192.168.0.1

##### NetworkManager.state ##############

[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true

##### NetworkManager.conf ###############

[main]
plugins=ifupdown,keyfile,ofono
dns=dnsmasq

[ifupdown]
managed=false

##### NetworkManager profiles ###########

##### iw reg get ########################

nl80211 not found.

##### iwlist channels ###################

lo no frequency information.

br-bd9e9ee0ec19 no frequency information.

br-860441bdf0a3 no frequency information.

veth9cfda22 no frequency information.

docker0 no frequency information.

eth0 no frequency information.

##### iwlist scan #######################

lo Interface doesn't support scanning.

br-bd9e9ee0ec19 Interface doesn't support scanning.

br-860441bdf0a3 Interface doesn't support scanning.

veth9cfda22 Interface doesn't support scanning.

docker0 Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

##### module infos ######################

##### module parameters #################

##### /etc/modules ######################

lp
rtc
lp
rtc

##### modprobe options ##################

[/etc/modprobe.d/blacklist-ath_pci.conf]
blacklist ath_pci

[/etc/modprobe.d/blacklist.conf]
blacklist evbug
blacklist usbmouse
blacklist usbkbd
blacklist eepro100
blacklist de4x5
blacklist eth1394
blacklist snd_intel8x0m
blacklist snd_aw2
blacklist i2c_i801
blacklist prism54
blacklist bcm43xx
blacklist garmin_gps
blacklist asus_acpi
blacklist snd_pcsp
blacklist pcspkr
blacklist amd76x_edac

[/etc/modprobe.d/blacklist-rare-network.conf]
alias net-pf-3 off
alias net-pf-6 off
alias net-pf-9 off
alias net-pf-11 off
alias net-pf-12 off
alias net-pf-19 off
alias net-pf-21 off
alias net-pf-36 off

[/etc/modprobe.d/iwlwifi.conf]
remove iwlwifi
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs /sbin/rmmod)
&& /sbin/modprobe -r mac80211

[/etc/modprobe.d/mlx4.conf]
softdep mlx4_core post: mlx4_en

[/etc/modprobe.d/oem-workaround-jackpoll.conf]
options snd-hda-intel jackpoll_ms=500

[/etc/modprobe.d/oem-workaround-poweron.conf]
blacklist dell-wmi

##### rc.local ##########################

exit 0

##### pm-utils ##########################

[/etc/pm/power.d/disable_wol] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/laptop-mode] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/pci_devices] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/pcie_aspm] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/sched-powersave] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/usb_bluetooth] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/wireless] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

[/etc/pm/power.d/xfs_buffer] (777 root)
CONFFILE=/etc/default/tlp
LIBDIRS='/usr/lib /usr/lib64'
for d in ${LIBDIRS}; do
if [ -d "${d}/pm-utils/power.d" ]; then
blocked="${d}/pm-utils/power.d/${0##*/}"
break
fi
done
if [ -n "$blocked" ] && [ -x "$blocked" ]; then
# else nothing to disable -> don't read $CONFFILE
if [ -e "$CONFFILE" ] && . "$CONFFILE" && [ "$TLP_ENABLE" = '1' ]; then
# TLP is enabled -> disable $blocked
echo "Notice: '${blocked}' disabled by TLP."
else
exec "$blocked" $*
fi
fi
exit 0

##### udev rules ########################

[/etc/udev/rules.d/70-persistent-net.rules]
# USB device 0x:0x (smsc75xx)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x8086:0x24f3 (iwlwifi)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="<MAC address>", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="wlan*", NAME="wlan0"

##### dmesg #############################

########## wireless info END ############