Dot1q native VLAN tagging is whole new concept , it enables service providers to use a  single VLAN to support customers who have multiple VLANs, while  preserving customer VLAN IDs and keeping traffic in different customer  VLANs segregated.I am not...

Can you try configuring native vlan 6 on the port connected to PC because "If a packet has a VLAN ID that is the same as the  outgoing port native VLAN ID, the packet is sent untagged; otherwise,  the switch sends the packet with a tag " . 

What Waris mentioned is the workaround to install the patch . I have tried this method and it works .Thanks