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

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Message-ID: <Pine.LNX.4.44L0.1303191607390.1302-100000@iolanthe.rowland.org>
Date:	Tue, 19 Mar 2013 16:10:09 -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:

> > 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?

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.

Alan Stern

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