Re: Amazon Kindle disconnect after Synchronize Cache

On Sat, Mar 06, 2021 at 10:19:54AM +0800, Peter Chen wrote:

On Sat, Mar 6, 2021 at 3:17 AM Alan Stern [off-list ref] wrote:

quoted

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