linux-kernel - Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 8087:0020

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Date:	Thu, 25 Feb 2010 14:36:02 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
cc:	Ákos Maróy <akos@...oy.hu>,
	Sarah Sharp <sarah.a.sharp@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>
Subject: Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device
 8087:0020

On Thu, 25 Feb 2010, Sarah Sharp wrote:

> > > now, I unplug the USB DVD drive:
> > > 
> > > Feb 25 17:35:38 tonkachi kernel: [  276.374282] xhci_hcd 0000:02:00.0:
> > > WARN: transfer error on endpoint
> > > Feb 25 17:35:39 tonkachi kernel: [  276.728151] xhci_hcd 0000:02:00.0:
> > > WARN: transfer error on endpoint
> > > Feb 25 17:35:39 tonkachi kernel: [  276.728819] xhci_hcd 0000:02:00.0:
> > > WARN: transfer error on endpoint

Shouldn't there be some messages here about "USB disconnect"?  This 
suggests there's something wrong with the root hub.

> > > I plug it back in, with a DVD in the drive:
> > > 
> > > Feb 25 17:41:21 tonkachi kernel: [  618.701586] Registered led device:
> > > iwl-phy0::radio
> > > Feb 25 17:41:21 tonkachi kernel: [  618.701619] Registered led device:
> > > iwl-phy0::assoc
> > > Feb 25 17:41:21 tonkachi kernel: [  618.701649] Registered led device:
> > > iwl-phy0::RX
> > > Feb 25 17:41:21 tonkachi kernel: [  618.701674] Registered led device:
> > > iwl-phy0::TX
> > > Feb 25 17:41:21 tonkachi kernel: [  618.719536] usb 2-3: new high speed
> > > USB device using xhci_hcd and address 0
> > > Feb 25 17:41:21 tonkachi kernel: [  618.742028] usb 2-3: New USB device
> > > found, idVendor=058f, idProduct=6254
> > > Feb 25 17:41:21 tonkachi kernel: [  618.742034] usb 2-3: New USB device
> > > strings: Mfr=0, Product=0, SerialNumber=0
> > > Feb 25 17:41:21 tonkachi kernel: [  618.742155] usb 2-3: configuration
> > > #1 chosen from 1 choice
> > > Feb 25 17:41:21 tonkachi kernel: [  618.742168] usb 2-3: ep 0x81 -
> > > rounding interval to 2048 microframes

You must have plugged it into a different port this time, yes?

> That looks like a rather long polling interval.  Can you post the output
> of `lsusb -vvv -d 058f:6254`?

2048 microframes is 256 ms, the normal polling interval for hubs.

Alan Stern

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