You could compare the dmesg of 5.3 kernel and 5.4 kernel, for those lines which contains the iwlwifi.
In your 5.4 kernel dmesg: [ 2.757791] compat: loading out-of-tree module taints kernel. [ 2.757807] compat: module verification failed: signature and/or required key missing - tainting kernel [ 2.757934] Loading modules backported from iwlwifi [ 2.757934] iwlwifi-stack-public:master:8324:9176b151 Looks like your 5.4 kernel load an out-of-tree wifi driver. And please also compare the "loading firmware part" of iwlwifi. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1892163 Title: Major networking regression linux-image-5.4.0-42-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1892163/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
