I do have few questions regarding usbser.sys.
1> Does it support "Selective Suspend"?
2> Like "SelectiveSuspendEnabled" flag in input.inf(Microsoft provided) for HID Class, is there any flag for usbser.sys for the "Selective suspend" if it supports?
3> Whenever our system enters into Global Suspend(Stand-By mode / S3 state), what will be the behavior of usbser.sys? Will the device get into suspended mode?
Here is a link to OSR which points to a number of references that may help you here.
Apparently, usbser does not support USB SS
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