Ubuntu – WiFi not working after latest Ubuntu software update

dellnetworkingwireless

I have a Dell laptop running Ubuntu 14.04 LTS
I purchased it new about a month ago.
This morning I got a popup about a Software Update available, so I updated, and now the wifi is not working at all.
I checked the networking menu and it shows NO networks detected.
Everything worked just fine until this latest software update.

Here's the output from lspci -knn | grep Net -A2

3a:00.0 Network Contoller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
         Subsystem: Intel Corporation Device [8086:0050]
3b:00.0 Unassingned class [ff00]: Realtek Semiconductor Co. ltd. Device [10ec:525a] (rev 01)

I tried the mokutil disable validation as described in the other problem report

sudo apt install mokutil
sudo mokutil –disable-validation

it forced me to create a new password, but still no wifi!!!

Here is lspci -vvnn
3a.00.0 Network Controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
Subsytem : Intel Corporation Device [8086:0050]
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B- ParERR- DEVSEL=fast >TAbort- SERR-

What driver should I have for the Intel 8260? I did lmod and I didn't see anything that looked like a wifi driver…

Best Answer

I booted in to the Bios Menu page, but hitting F-12 when the Dell logo appeared during boot up... I found the SecureBootMode setting under the Security settings, and disabled it, then after rebooting everything was fine.

Install to Ubuntu 14.04

Download these files:

http://mirrors.kernel.org/ubuntu/pool/main/l/linux-meta-lts-wily/linux-headers-generic-lts-wily_4.2.0.42.34_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-lts-wily/linux-headers-4.2.0-42-generic_4.2.0-42.49~14.04.1_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-lts-wily/linux-headers-4.2.0-42_4.2.0-42.49~14.04.1_all.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-meta-lts-wily/linux-generic-lts-wily_4.2.0.42.34_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-meta-lts-wily/linux-image-generic-lts-wily_4.2.0.42.34_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-lts-wily/linux-image-4.2.0-42-generic_4.2.0-42.49~14.04.1_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-lts-wily/linux-image-extra-4.2.0-42-generic_4.2.0-42.49~14.04.1_amd64.deb
http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.127.22_all.deb

Copy the files to your home folder and run in terminal:

sudo dpkg -i linux*.deb

Reboot and test the Wi-Fi.

Ubuntu – Help 6Mb/s WIFI connection speed Qualcomm Atheros Device [168c:0042] (rev 31)

My connection information also shows 6 Mbps:

$ iwconfig
enp59s0   no wireless extensions.

lo        no wireless extensions.

wlp60s0   IEEE 802.11  ESSID:"TELUS1213-5G"  
          Mode:Managed  Frequency:5.22 GHz  Access Point: 70:F1:96:42:5F:06   
          Bit Rate=6 Mb/s   Tx-Power=17 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=64/70  Signal level=-46 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:81   Missed beacon:0

However speedtest.net reports almost 60 Mbps throughput:

Running the same test on an Ethernet adapter rated at 1000 Mbps results in same 60 Mbps Internet download speed. So speed is limited by ISP not by WiFi. Relevant lspci -vv:

3b:00.0 Ethernet controller: Qualcomm Atheros Killer E2400 Gigabit Ethernet Controller (rev 10)
    Subsystem: Device 0707:2400
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 16
    Region 0: Memory at dd600000 (64-bit, non-prefetchable) [size=256K]
    Region 2: I/O ports at d000 [size=128]
    Capabilities: <access denied>
    Kernel driver in use: alx
    Kernel modules: alx

3c:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
    Subsystem: Bigfoot Networks, Inc. QCA6174 802.11ac Wireless Network Adapter
    Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 137
    Region 0: Memory at dd200000 (64-bit, non-prefetchable) [size=2M]
    Capabilities: <access denied>
    Kernel driver in use: ath10k_pci
    Kernel modules: ath10k_pci

I can't explain why the iwconfig speed is so low when the real speed is so high. The same results are obtained from other Linux CLI sources:

$ iw dev wlp60s0 link
    (... SNIP ...)
    freq: 5220
    RX: 1421503515 bytes (4545343 packets)
    TX: 131449836 bytes (1061284 packets)
    signal: -55 dBm
    tx bitrate: 6.0 MBit/s

    bss flags:  short-preamble short-slot-time
    dtim period:    2
    beacon int: 100

$ iwlist wlp60s0 bitrate
wlp60s0   unknown bit-rate information.
          Current Bit Rate=6 Mb/s

Best Answer

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Install to Ubuntu 14.04

Ubuntu – Help 6Mb/s WIFI connection speed Qualcomm Atheros Device [168c:0042] (rev 31)

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