I am a newbie to Ubuntu and this is my first post on this forum, so please excuse any mistake.

Having said that the issue is after I recently installed Ubuntu 18.04 LTS, I noticed that my Wifi signal is very weak. I have 2 OS, Windows 10 and Ubuntu 18.04. While Windows 10 shows proper signal, in Ubuntu the signal is very weak. I have not even seen full signal anytime, even though when I am literally sitting next to the router.

My Driver details are below:




02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)


lspci -nnk | grep -A2 0280


02:00.0 Network controller [0280]: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter [168c:0042] (rev 31)
Subsystem: AzureWave QCA9377 802.11ac Wireless Network Adapter [1a3b:2231]
Kernel driver in use: ath10k_pci


sudo lshw -C network


   description: Wireless interface
   product: QCA9377 802.11ac Wireless Network Adapter
   vendor: Qualcomm Atheros
   physical id: 0
   bus info: pci@0000:02:00.0
   logical name: wlp2s0
   version: 31
   serial: 40:9f:38:d4:ac:c3
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
   configuration: broadcast=yes driver=ath10k_pci driverversion=4.15.0-20-generic firmware=WLAN.TF.1.0-00002-QCATFSWPZ-5 ip= latency=0 link=yes multicast=yes wireless=IEEE 802.11
   resources: irq:130 memory:ef000000-ef1fffff

I have tried doing the below but to no affect:

sudo modprobe -rv ath10k_pci
sudo modprobe -v ath10k_pci ant_sel=1

My current kernel version is:


Any suggestions to improve this?

  • Have you setup the regulatory domain for the wifi ? This means inform the kernel of the country you leave in. Install and configure crda and change REGDOMAIN in /etc/default/crda
    – solsTiCe
    Commented May 8, 2018 at 17:43
  • @solsTiCe, crda was already installed, so I just updated the entry REGDOMAIN=IN as I live in India. Rebooted but still no change. I also ran the command iw reg set IN but no affect.
    – wambling
    Commented May 9, 2018 at 3:14
  • @wambling Have you figured it out? I am having the same issue with a Lenovo Ideapad 330S with the ath10k_pci driver. The ant_sel=1 or 2 did not help, and iw reg set US did not help either.
    – Andrew
    Commented Nov 19, 2018 at 1:33
  • @Andrew: The answer provided by mature and manas worked for me.
    – wambling
    Commented Jul 21, 2019 at 16:21

4 Answers 4


Suggest, after you do

sudo modprobe -rv ath10k_pci   

to try

sudo modprobe -v ath10k_pci ant_sel=2

as it might be an RF issue which Windows resolved by using antenna #2.

  • sudo modprobe -v ath10k_pci ant_sel=2
    – Jang Dev
    Commented May 14, 2018 at 16:18
  • Thanks.. I did try that already, though it seems to have improved but sometimes again it goes back to very weak signal. I also noticed, the signal remains constant and strong if I boot my laptop, while sitting close to the router but if I boot while few meters away like 3-4 meters from router, the signal strength is less than 50.
    – wambling
    Commented Aug 19, 2018 at 5:03
  • ant_sel=2 isn't even an option for ath10k_pci, check modinfo -p ath10k_pci and see there is no ant_sel parameter option, there is no possible way for it to work, it does work for rtl8723be, see modinfo -p rtl8723be but that only works for rtl8723be chipsets
    – Jeremy31
    Commented Apr 24, 2019 at 21:08
  • worked for me, ath9k driver
    – TimSparrow
    Commented Feb 6, 2020 at 13:55
  • 1
    This worked in 20.04 ! Thanks for the insight
    – SeanO
    Commented Jun 4, 2020 at 16:21

Run in terminal

sudo tee /etc/modprobe.d/rtl8723be.conf <<< "options rtl8723be ant_sel=2"

This will create a config file to make the setting permanent. Then restart.


For all other Qualcomm cards...

check this command lspci | grep 'Network'

if output comes as

02:00.0 Network controller: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter (rev 31)

Then this solution may work for you

sudo apt-get update
sudo apt-get install linux-headers-generic build-essential
wget https://www.kernel.org/pub/linux/kernel/projects/backports/2015/11/20/backports-20151120.tar.gz
tar -zxvf backports-20151120.tar.gz
cd backports-20151120
make defconfig-ath10k
sudo make install

ignore if you get any errors or warnings for make

  • ignore and proceed with the installation in case of errors in make? Just a note, for me the internet speed seems to be ok. the weak only i wifi arc visible in the signal. Might be the UI skin issue in elementary OS Commented Nov 12, 2019 at 3:21

This solution given by Manas worked for me with some minor tweak.

Before executing the wget command check for you linux kernel version.

$ uname -r

Then go to https://mirrors.edge.kernel.org/pub/linux/kernel/projects/backports/stable/ and check for the closest kernel version available there and then download the backports tar file using the following command.

$ wget https://kernel.org/pub/linux/kernel/projects/backports/stable/v5.1.16/backports-5.1.16-1.tar.gz

Here 5.1.16 is the linux kernel version.

Then run these. After successful installation of these three commands reboot.

$ make defconfig-ath10k
$ make
$ sudo make install


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