On Sat, Mar 06, 2021 at 10:19:54AM +0800, Peter Chen wrote: > On Sat, Mar 6, 2021 at 3:17 AM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > Is runtime power management enabled? Maybe the Kindle disconnects > > whenever the computer tries to suspend it. This typically happens 2 > > seconds after the last command was issued, which matches your > > observations. If runtime PM is enabled, you can try disabling it. > > > > > Alan, I think you may be right. It might want to support the feature like > kindle goes to suspend after the Windows PC > enters suspend (but VBUS is there), the Windows PC may never suspend the > bus if a mass storage device is connected. That's possible. I have never tried to measure the bus activity when a Windows host is suspended. Alan Stern
