It might be caused by the patch https://github.com/torvalds/linux/commit/a4dcfbc4ee2218abd567d81d795082d8d4afcdf6 which is the only difference between 20.10 and 21.04 kernel.
I build a test hirsute kernel in https://people.canonical.com/~mschiu77/lp1931301/v1/, could you install and check if the problem still persists? Please also provide me the full dmesg log based on this kernel. Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1931301 Title: NIC unavailable after suspend to RAM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1931301/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
