Virtualhere USB Root Hub remains active during S0 low power idle
I have been trying out VirtualHere on a laptop which uses S0 low power idle (aka Modern Standby or Connected Standby) instead of the traditional S3 standby. On this machine, powercfg -sleepstudy
shows that the VirtualHere root hub (USB Root Hub (xHCI) (USB\ROOT_HUB30)
) remains active during standby. This appears to result in a small power drain during sleep: powercfg -batteryreport
indicates that 2% (1010mWh) was used during a 11-hour sleep.