As you may see, there's no PID, VID or SN information!!!! I think this is quite strange.
I also tried the "show switch stack-ports", and the output is:
DF-SED0-TE0-SWE-01#show switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Down Down
Surprisingly, both of the commands above show the same output when performed in other switches here which don't even have the stack module. So I have no evidence that the WS-C2960S-STACK module is working.
I have seen this before and can confirm it is normal not to see any PID or Serial numbers with show commands. I agree its pretty odd that show inventory doesnt show this information and hope Cisco changes this with future software or hardware revisions.
I believe the only way to troubleshoot the module working or not might be to loop it back to itself. This should make the ports show UP UP but you should only do this in a test environment as i cannot comment what effect this will have on production traffic. I know this works fine with 3750 switches to test the stack ports and suggest the same here.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
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