Tried the upstream kernel you linked to, however it fails to boot with the messages "Fast TSC calibration failed" and a few seconds later "/dev/disk/by-uuid/[uuid number]/ does not exist". Booting the 12.04 supplied kernel continues to work as normal.
** Tags added: kernel-unable-to-test-upstream -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1152861 Title: TP-LINK TL-WN821N v4 Detected but does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1152861/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
