Windows 7 RTM: Loopback SMB over TCP/IPv6 connection preventing sleep mode

Windows 7 RTM: Loopback SMB over TCP/IPv6 connection preventing sleep mode

I'm running Windows 7 RTM with homegroup, network discovery, file and printer sharing, public folder, media streaming and Windows Media Player Network Sharing Service all turned off, but the computer still doesn't go to sleep. powercfg -requests shows this: