I just installed Ubuntu 18.04 as dualboot next to Windows on my Dell Precision 5530. I have got issues with the wifi connection. I can connect to my wifi network as one would expect. But when as I start a download, it loads a couple of mb and then the download fails due to a network error. Also the touchpad does not work for a brief moment and the whole system freezes or is laggy for a short period. It feels like something crashes as soon as there is load on the wifi chip and it takes a while to recover.

I'm not very experienced with linux so I hope you can help me to resolve this issue. My current workaround is to use a USB Wifi dongle, which is pretty slow.

What I tried so far:

• Disable fastboot in windows.
• Install the intel driver from their website, but im not sure if extracting the files to /lib/firmware is installing.

Here is my output from running after reproducing the issue: wget -N -t 5 -T 10 && chmod +x wireless-info && ./wireless-info

Here is some more info requested in the comments:

free -h total used free shared buff/cache available
Mem: 15G 3,5G 3,1G 1,2G 8,7G 10G
Swap: 2,0G 627M 1,4G

sysctl vm.swappiness
vm.swappiness = 60

sudo dmidecode -s bios-version
1.6.0

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2 Answers

We see these interesting clues in your wireless_info:

Queue 0 is inactive on fifo 2 and stuck for 2500 ms. SW [145, 146] HW [162, 162] FH TRB=0x0a5a5a5a2

Which leads to this: and then to this:

Intel Dual Band Wireless-AC 7260 adapter hungs with 40MHz width connection

We also see:

Reason: 6=CLASS2_FRAME_FROM_NONAUTH_STA

Which leads to this:

Update: I solved the issue by deactivating the "WiFi Coexist" option in my FritzBox router which apparently switches from 40MHz to 20MHz every time it detects too many 40MHz routers nearby. This makes the ath10k firmware crash (my old laptop and my phone handle those switches nicely).

I recommend that you change the settings in the router to specify a channel width of 20 MHz in the 2.4 GHz band instead of automatic 20/40 MHz, although it is likely to affect N speeds.

If you do not have administrative priveleges for the router, then try:

sudo -i
echo "options cfg80211 cfg80211_disable_40mhz_24ghz=Y" > /etc/modprobe.d/cfg80211.conf
exit

Reboot and let us hear the result.

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Dell Precision 5530

You have a very old BIOS, 1.6.0, dated 12/3/2018.

There's a newer BIOS available, 1.16.2, dated 5/13/2020, and can be downloaded here.

Note: Have good backups before updating the BIOS.

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