linux-kernel - Re: [ 12/75] USB: EHCI: work around silicon bug in Intels EHCI controllers

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Date:	Tue, 19 Mar 2013 17:00:43 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Sven Joachim <svenjoac@....de>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	Stephen Thirlwall <sdt@...com>
Subject: Re: [ 12/75] USB: EHCI: work around silicon bug in Intels EHCI
 controllers

On Tue, 19 Mar 2013, Sven Joachim wrote:

> On 2013-03-19 21:10 +0100, Alan Stern wrote:
> 
> > On Tue, 19 Mar 2013, Sven Joachim wrote:
> >
> >> > In what way is resume broken?
> >> 
> >> The kernel comes back, but the screen is black.  Manually switching VT's
> >> is possible, and if I type something I can see it on the screen, but
> >> there is no response and the cursor does not blink.  It looks as if the
> >> VT is not switched backed on resume, and userspace tasks are not
> >> restarted.  Sysrq combinations apparently work, but produce no output.
> >
> > Are there any other problems?  For example, even before you do a 
> > suspend, if you type Alt-SysRq-W do you see any processes listed?
> 
> No.
> 
> > There was another report on the linux-usb mailing list today of this
> > same patch causing the khubd task to hang.  I'm thinking that you might
> > be facing a similar problem.
> 
> Maybe, but before the suspend everything seems to be normal.

Just out of curiosity, does the patch posted here:

	http://marc.info/?l=linux-usb&m=136361874807411&w=2

make any difference?

Alan Stern

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