Another data point: an Aventra MyEID PKI card (http://www.aventra.fi/webshop/index.php?route=product/product&product_id=53 ; it's apparently a "version 4", on the invoice it's identified as SKU: MYEID and MPN: TH#130) works fine in this Alcor reader under OpenSC on Ubuntu. The only card that has this flapping problem with this reader under Linux so far is the Feitian/Entersafe A22CR, and again, the A22CR+Alcor combo doesn't flap the same way under Windows.
Another data point: an Aventra MyEID PKI card (http:// www.aventra. fi/webshop/ index.php? route=product/ product& product_ id=53 ; it's apparently a "version 4", on the invoice it's identified as SKU: MYEID and MPN: TH#130) works fine in this Alcor reader under OpenSC on Ubuntu. The only card that has this flapping problem with this reader under Linux so far is the Feitian/Entersafe A22CR, and again, the A22CR+Alcor combo doesn't flap the same way under Windows.