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Zahra avatar Ubuntu

Ubuntu 21.10 wireless card/adapter not found

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Zahra

I have been 3 days w/o wifi on my Linux/Ubuntu machine with a Dell XPS-9500 and Qualcomm/Killer Wificard. I have tried every tutorial I could find on this topic with no luck. When I type sudo lshw -C network there is no wireless connection at all. I have the ath11k driver installed, my kernel is linux 5.13.0-21-generic, and out of despair I upgraded from Ubuntu 20.04 to 21.10, which still did not fix the issue. I have reinstalled multiple kernel versions multiple times (5.14, 5.11..) and tried to follow this guide: https://mukaiguy.com/adding-wifi-drivers-to-ubuntu-linux-for-dells-xps-15-9500-with-ax500-f535fb42db70 However, whenever I try to build the kernel with make commands, I get error messages ('Error 2').

Any ideas what I should try would be greatly appreciated. Thank you! (wifi used to work fine under Linux until now, it is a dual boot machine, and under windows, wifi still works, thus no hardware issue I presume).

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user535733 avatar
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user535733
Testing hardware in situations like this is what a LiveUSB's "Try Ubuntu" environment is for -- so you're not haywiring your installed system and possibly making the problem worse.
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chili555 avatar
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chili555
Please see: "I had disabled the UEFI wifi stack option in BIOS because I did not know what it does. This seems to disable the device... I went back and booted the -20 kernel and the device works with that kernel!" It's a comment here: https://askubuntu.com/questions/1374546/ubuntu-21-10-on-dell-xps-13-9310-wifi-killer-ax500s-dbs-stopped-working-in-kerne/1374783#1374783
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Nathan avatar Ubuntu
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Nathan

This is the same problem that is reported for the Dell XPS 13 9310 which has the same wifi card: Ubuntu 21.10 on Dell XPS 13 9310 WiFi Killer AX500s DBS stopped working in kernel 5.13.0-21-generic

and links to here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1950515

The older kernel builds 5.13.0-19 or 5.13.0-20 appear to work. Install the old kernel and cold boot (shutdown and power on) instead of just restarting.

This appears to just be a regression in the 5.13.0-21 kernel build, but may be fixed in a newer build.

I have the same problem with my Dell XPS 15 9500 on Ubuntu 21.04. I'm using the HWE (HardWare Enablement) kernel build. linux-generic-hwe-20.04 linux-headers-generic-hwe-20.04 linux-image-generic-hwe-20.04 Upgrading from 5.11.0.38.39 to 5.11.0.40.41 breaks the wifi. I fixed wifi by rolling back to my earlier btrfs snapshot of my rootfs before the update and did a cold boot.
I also turned off the automatic updates, so that it wouldn't automatically install the kernel with broken wifi again.

sudo dpkg-reconfigure unattended-upgrades

I created another btrfs snapshot of rootfs with the wifi working and automatic updates disabled.

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