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Re: problems with usb stick after suspend and wake up



On Mon, 29 Sep 2014, Ivan Baldo wrote:

> El 29/09/14 11:15, Alan Stern escribió:
> > The first error occurred the first time the computer tried to write
> > data to the stick following the resume.  Oddly enough, an earlier write
> > before the suspend worked correctly.  But the real problem occurred
> > when the computer asked the stick to provide the reason for the error.
> > At that point the stick refused to answer.
> >
> > There were several resets, and the write was retried after each reset.
> > And each time the write failed, and the stick refused to answer when
> > asked the reason for the failure.
> >
> > There's no obvious cause for this problem.  It really looks like
> > something is wrong with the USB stick.
>      Ok the culprit is the USB stick, but when retrying and seeing that 
> the resets are unsuccessful, could the USB power be removed for the 
> stick for half a second and restored and the write retried then?

The simple answer is No.  Host USB controllers often are not capable of 
turning off USB power.

Besides, what would happen if the device were not a stick but a disk 
drive with an external power supply?

Alan Stern


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