Laptop: Acer V 13
no preinstalled OS. Freshly installed ubuntu 16.04.

At the top right corner, when I click the network manager, no wifi networks are found, and there's a grayed out device not ready text instead.

Ethernet cable is working (this is how I'm posting this ...)

I'm in a co working space with many networks and users so I know the problem is on my end.

Below you will find everything I've tried followed by every piece of information I thought might b relevant.

I also logged the result of this script which has some additional info, and tailed syslog for a while.

Thanks in advance, you rock! :)

Things I've tried:

  1. $ sudo service network-manager start
    (No output)
  2. $ sudo service network-manager stop && sudo service network-manager start
    No output, network icon dissapears and reappears from tray
  3. $ sudo ifup lo ifup: interface lo already configured
  4. $ sudo ifup enp2s0 Unknown interface enp2s0
  5. using wicd network manager
    I didn't detect any wireless network as well.
    (I'm actually glad it didn't work, seems like a bad idea anyway)
  6. $ sudo service networking restart
  7. $ sudo service NetworkManager restart
  8. $ sudo echo "blacklist ath10k_pci" >> /etc/modprobe.d/blacklist.conf
    after rebooting, any reference to wifi was gone from the network manager menu in the tray
  9. $ sudo apt-get install bcmwl-kernel-source
    Reading package lists... Done Building dependency tree
    Reading state information... Done The following packages were automatically installed and are no longer required: gksu libgksu2-0 libglade2-0 python-cairo python-dbus python-gi python-glade2 python-gobject python-gobject-2 python-gtk2 python-notify python-wicd wicd-daemon Use 'sudo apt autoremove' to remove them. The following additional packages will be installed: dkms The following NEW packages will be installed: bcmwl-kernel-source dkms 0 upgraded, 2 newly installed, 0 to remove and 315 not upgraded. Need to get 1581 kB of archives. After this operation, 8278 kB of additional disk space will be used. Do you want to continue? [Y/n] Get:1 http://pl.archive.ubuntu.com/ubuntu xenial-updates/main amd64 dkms all [66,2 kB] Get:2 http://pl.archive.ubuntu.com/ubuntu xenial/restricted amd64 bcmwl-kernel-source amd64 [1515 kB] Fetched 1581 kB in 0s (4809 kB/s)
    Selecting previously unselected package dkms. (Reading database ... 206160 files and directories currently installed.) Preparing to unpack .../dkms_2.2.0.3-2ubuntu11.1_all.deb ... Unpacking dkms ( ... Selecting previously unselected package bcmwl-kernel-source. Preparing to unpack .../bcmwl-kernel-source_6.30.223.248+bdcom-0ubuntu8_amd64.deb ... Unpacking bcmwl-kernel-source ( ... Processing triggers for man-db (2.7.5-1) ... Setting up dkms ( ... Setting up bcmwl-kernel-source ( ... Loading new bcmwl- DKMS files... First Installation: checking all kernels... Building only for 4.4.0-34-generic Building for architecture x86_64 Building initial module for 4.4.0-34-generic Done. wl: Running module version sanity check.

    • Original module
      • No original module exists within this kernel
    • Installation
      • Installing to /lib/modules/4.4.0-34-generic/updates/dkms/ depmod.... DKMS: install completed. modprobe: ERROR: could not insert 'wl': Required key not available update-initramfs: deferring update (trigger activated) Processing triggers for shim-signed (1.18~16.04.1+0.8-0ubuntu2) ... Processing triggers for initramfs-tools (0.122ubuntu8) ... update-initramfs: Generating /boot/initrd.img-4.4.0-34-generic W: Possible missing firmware /lib/firmware/i915/skl_guc_ver6.bin for module i915_bpo ```
  10. signed and loaded module wl:

$ openssl req -new -x509 -newkey rsa:2048 -keyout MOK.priv -outform DER -out MOK.der -nodes -days 36500 -subj "/CN=awesome key/" $ sudo /usr/src/linux-headers-$(uname -r)/scripts/sign-file sha256 ./MOK.priv ./MOK.der $(modinfo -n wl) $ sudo mokutil --import MOK.der $ reboot $ sudo modprobe wl # no error output this time :)

  1. reinstalling some packages: $ sudo apt-get purge bcmwl-kernel-source $ sudo apt-get install build-essential dkms linux-headers-generic $ sudo apt-get update $ sudo apt-get install bcmwl-kernel-source $ modprobe -r b43 bcma $ modprobe -r brcmsmac bcma $ modprobe -r wl $ modprobe wl $ reboot

Relevant Info:

$ rfkill list
0: acer-wireless: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: hci0: Bluetooth
    Soft blocked: yes
    Hard blocked: no
2: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no


$ cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback


$ iwconfig
wlp3s0    IEEE 802.11abgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

enp2s0    no wireless extensions.

lo        no wireless extensions.


$ sudo lshw -c network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: enp2s0
       version: 15
       serial: 30:65:ec:9a:29:e2
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip= latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:124 ioport:3000(size=256) memory:a1204000-a1204fff memory:a1200000-a1203fff
  *-network DISABLED
       description: Wireless interface
       product: QCA6174 802.11ac Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlp3s0
       version: 32
       serial: c8:ff:28:00:90:51
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=ath10k_pci driverversion=4.4.0-34-generic firmware=WLAN.RM.2.0-00180-QCARMSWPZ-1 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
       resources: irq:127 memory:a1000000-a11fffff


lspci -knn | grep Net -A2
03:00.0 Network controller [0280]: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter [168c:003e] (rev 32)
    Subsystem: Lite-On Communications Inc QCA6174 802.11ac Wireless Network Adapter [11ad:0807]
    Kernel driver in use: ath10k_pci
    Kernel modules: ath10k_pci, wl


in the next file, I've tried to set managed=true and reboot, tho somewhere it got reverted back to managed=false

$ cat  /etc/NetworkManager/NetworkManager.conf



    $ dmesg | grep "\(disabled\|switch\)"
[    0.000000] x86/fpu: Using 'eager' FPU context switches.
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000]   8 disabled
[    0.000000]   9 disabled
[    0.000000] ACPI: Early table checksum verification disabled
[    0.069778] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[    0.237651] pci 0000:00:14.0: System wakeup disabled by ACPI
[    0.244497] pci 0000:00:1c.0: System wakeup disabled by ACPI
[    0.245318] pci 0000:00:1c.4: System wakeup disabled by ACPI
[    0.246125] pci 0000:00:1c.5: System wakeup disabled by ACPI
[    0.248614] pci 0000:00:1f.3: System wakeup disabled by ACPI
[    0.249896] pci 0000:02:00.0: System wakeup disabled by ACPI
[    0.256218] pci 0000:03:00.0: System wakeup disabled by ACPI
[    0.937596] audit: initializing netlink subsys (disabled)
[    0.942695] Console: switching to colour frame buffer device 240x67
[    0.970222] i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp
[    1.103625] fb: switching to inteldrmfb from EFI VGA
[    1.103641] Console: switching to colour dummy device 80x25
[    1.254041] Console: switching to colour frame buffer device 240x67
[ 1117.284285] xhci_hcd 0000:00:14.0: System wakeup disabled by ACPI
[ 1117.292227] rtc_cmos 00:03: System wakeup disabled by ACPI
[ 1117.292230] r8169 0000:02:00.0: System wakeup disabled by ACPI


$ ifconfig
enp2s0    Link encap:Ethernet  HWaddr 30:65:ec:9a:29:e2  
          inet addr:  Bcast:  Mask:
          RX packets:26514 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18223 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:32858129 (32.8 MB)  TX bytes:2703210 (2.7 MB)

lo        Link encap:Local Loopback  
          inet addr:  Mask:
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2379 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2379 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:217304 (217.3 KB)  TX bytes:217304 (217.3 KB)


  • Why do you install Broadcom drivers for a Qualcomm adapter. It is confusing? Probably some people think that Broadcom is a synonym of "wireless". – Pilot6 Aug 10 '16 at 14:17
  • Which step r u referring to? – Adam Goldman Aug 11 '16 at 6:44
  • bcmwl-kwernel-source is a Broadcom proprietary driver. wl is a Broadcom kernel module, etc. – Pilot6 Aug 11 '16 at 8:55
  • DIdn't know that – Adam Goldman Aug 11 '16 at 9:22
  • What did you think it was? – Pilot6 Aug 11 '16 at 9:32

I don't know why it worked, here's what I did:

Backed up /lib/firmware/ath10k/QCA6174
Replaced it with https://github.com/kvalo/ath10k-firmware/tree/master/QCA6174

At this point wifi was completely gone from the network manager menu.
so I restored the original QCA6174 folder, rebooted, and it works now!

Marking as solved.
If anyone knows why this worked I'm very curious ...

| improve this answer | |
  • 1
    I have no idea why it works, but I can confirm this works on Lenovo Y900-Y17ISK. – peter.babic Nov 12 '17 at 15:46

I had this problem, and the backup, download from GitHub, restore method worked for me, only slightly different. I think it's important to note, as it could affect others who use this method.

Once I had downloaded the GitHub folder, put it in place and rebooted, everything was fixed; I didn't need to restore. I'm not sure what caused this (since my WiFi had been working fine for ages before this problem, and I can't think of anything that changed), but when I compare the two, I find that the backup was missing a whole load of stuff.

It only contained board.bin, board-2.bin, firmware-4.bin, firmware-6.bin, notice_ath10k_firmware-4.txt and notice_ath10k_firmware-46.txt. This means that 6 folders and a few additional files were missing; files and folders that make up the bulk of QCA6174 (the GitHub version is 32.6MB, my backup was only 3MB).

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.