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I am running an install of Manjaro on a Dell XPS 9560. Recently a problem has developed that is very annoying.

At random times throughout the day my wifi will drop out. It will not disconnect (it will show I am connected) however pings will fail to any domain. This only occurs on this laptop.

I have ran dmesg and noticed a bunch of blocks on DNS for multicast. As a result I did ufw allow out dns thinking perhaps this was the issue but it isn't. I have also tried to reinstall wpa-supplicant to no avail. I suspecting this was the case since I am connecting to a WPA network and it did not fix it. After adding the new UFW rules dmesg does not show anything unusual during the times the wifi drops out.

Running sudo systemctl | grep network gives me:

network-online.target                                                                  loaded active active    Network is Online                                                            
network.target                                                                         loaded active active    Network   

And sudo systemctl | grep net

sys-devices-pciMY_DEVICE_ID-net-wlp2s0.device                     loaded active plugged   QCA6174 802.11ac Wireless Network Adapter                                    
sys-subsystem-net-devices-wlp2s0.device                                                loaded active plugged   QCA6174 802.11ac Wireless Network Adapter                                    
network-online.target                                                                  loaded active active    Network is Online                                                            
network.target                                                                         loaded active active    Network    

A call to networkctl gives:

WARNING: systemd-networkd is not running, output will be incomplete.

IDX LINK   TYPE     OPERATIONAL SETUP    
  1 lo     loopback n/a         unmanaged
  2 wlp2s0 wlan     n/a         unmanaged

Tailing journalctl nothing looked super suspicious. There are a lot of calls to "Activating wireless network xyz <2 of 5>" but nothing else out of the ordinary.

From lspci -k

02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
    Subsystem: Bigfoot Networks, Inc. QCA6174 802.11ac Wireless Network Adapter
    Kernel driver in use: ath10k_pci

I am at a loss at what is causing this and it is very disruptive. Any guesses?

2 Answers 2

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This appears to have been dhcpcd conflicting with dhclient. By disabling dhcpcd and enabling dhclient, as well as configuring NetworkManager to use dhclient seems to have remedied the situation - at least temporarily. There were no indications this was the case in any of the logs.

I will report back if the problem persists. I hope this is fixed in a future release of Manjaro.

EDIT:

The problem is not fixed. However, rerunning dhclient when it dies fixes it. Very annoying. Rerunning dhclient occurs almost every hour.

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In my case problem was with the kernel. I downgraded kernel from 5.15 to 4.19.

Just changing kernel might fix the issue. Try that.

I tried 3 different kernels and 4.19 was the right one.

Additionally if that doesn't work, you could do one more thing, check which wifi-card you have inxi -N and download driver for your system.

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