Comment 27 for bug 1152861

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Ryan Williams (theamazingjanet) wrote : Re: TP-LINK TL-WN821N v4 Detected but does not work

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.