My Dell XPS 15 (haswell) was working fine until I stupidly accepted recently to apply Ubuntu updates. Since then, my wifi does not work (it shows "device not managed" when clicking wifi icon in toolbar). Even USB to Ethernet adapter does not seem to work. Bluetooth at least "sees" other bluetooth devices around...

See below output from dmesg (dmesg |grep iwl) :

[  886.462459] iwlwifi 0000:06:00.0: irq 51 for MSI/MSI-X
[  886.462561] iwlwifi 0000:06:00.0: Direct firmware load failed with error -2
[  886.462562] iwlwifi 0000:06:00.0: Falling back to user helper
[  886.463284] iwlwifi 0000:06:00.0: loaded firmware version 22.1.7.0 op_mode iwlmvm
[  886.475345] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[  886.475433] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S
[  886.475684] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S
[  886.689214] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'

Below the output from modinfo iwlwifi:

filename:       /lib/modules/3.13.0-29-       generic/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko
license:        GPL
author:         Copyright(c) 2003-2013 Intel Corporation <[email protected]>
version:        in-tree:
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-5.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-4.ucode
firmware:       iwlwifi-3160-7.ucode
firmware:       iwlwifi-7260-7.ucode
srcversion:     1E6912E109D5A43B310FB34
alias:          pci:v00008086d0000095Asv*sd00005490bc*sc*i*

(a pack of lines of kind "alias:  pci:xxxxx...." that I guess are not helpful)

alias:          pci:v00008086d0000095Bsv*sd00005290bc*sc*i*
depends:        cfg80211
intree:         Y
vermagic:       3.13.0-29-generic SMP mod_unload modversions 
signer:         Magrathea: Glacier signing key
sig_key:        66:02:CB:36:F1:31:3B:EA:01:C4:BD:A9:65:67:CF:A7:23:C9:70:D8
sig_hashalgo:   sha512
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm:           wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable, 2=enable (default: 0) (int)
parm:           nvm_file:NVM file name (charp)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off     (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)

I downloaded the latest versions of iwlwifi firmware from git (git clone git://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git; copy iwlwifi-3160-9.ucode iwlwifi-7260-9.ucode iwlwifi-7265-9.ucode to /lib/firmware and reboot) but as you can imagine it did not help.

Update #1:

Downloaded from http://wireless.kernel.org/en/users/Drivers/iwlwifi?action=AttachFile&do=get&target=iwlwifi-7260-ucode-22.15.8.0.tgz

and copied the file into /lib/firmware.

After reloading it with modprobe, it seems to be OK:

[   14.761283] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002)
[   14.761472] iwlwifi 0000:06:00.0: irq 51 for MSI/MSI-X
[   14.772478] iwlwifi 0000:06:00.0: loaded firmware version 22.15.8.0 op_mode iwlmvm
[   14.800274] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144
[   14.800349] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S
[   14.800657] iwlwifi 0000:06:00.0: L1 Enabled; Disabling L0S
[   15.007048] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'

However, clicking in wifi in the toolbar still shows "device not managed".

Any clues?

Many thanks!

Luis