linux-kernel - Re: [GIT PATCH] USB patches for 3.9-rc1

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Message-ID: <9798783.W2ijE8Yd31@vostro.rjw.lan>
Date:	Sat, 23 Feb 2013 01:19:13 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Fabio Baltieri <fabio.baltieri@...aro.org>
Cc:	Dave Jones <davej@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	tianyu.lan@...el.com, linux-acpi@...r.kernel.org
Subject: Re: [GIT PATCH] USB patches for 3.9-rc1

On Friday, February 22, 2013 10:51:58 PM Fabio Baltieri wrote:
> On Fri, Feb 22, 2013 at 03:59:54AM -0500, Dave Jones wrote:
> > On Thu, Feb 21, 2013 at 10:40:10AM -0800, Greg KH wrote:
> > 
> >  > USB patches for 3.9-rc1
> >  > 
> >  > Here's the big USB merge for 3.9-rc1
> >  > 
> >  > Nothing major, lots of gadget fixes, and of course, xhci stuff.
> > 
> > I get no USB devices recognised when I insert them any more, which
> > I think is pretty major.  I suspect it has something to do with this ?
> > 
> >  > Lan Tianyu (12):
> >  >       usb: add runtime pm support for usb port device
> >  >       usb: add usb port auto power off mechanism
> > 
> > It looks like every port on my laptop is powered down, as I can't
> > even charge devices with it.
> 
> Hi Dave,
> 
> I have the same problem (and almost the same laptop, Thinkpad T430
> here), all external USB ports without power - even the always-on one
> :-).
> 
> The bug seems to be ACPI related, I bisected it down to this patch:
> 
> f95988d ACPI / scan: Treat power resources in a special way
> 
> In the dmesg I have some error like these:
> 
> ACPI: Power Resource [PUBS] (on)
> ...
> pci 0000:00:14.0: System wakeup disabled by ACPI

They aren't errors in fact, just info messages.

> for the USB controllers in the broken kernel, there are some in your
> dmesg too.  I'll try to come up with a fix for current mainline, but all
> the acpi stuff is quite obscure to me and the patch does not revert
> cleanly, maybe Rafael (in CC) has some idea!

It won't revert, there's more stuff on top of it.  And it is a fix, so
reverting it is not really a good idea anyway.

I suspect that the USB controllers are put into low-power states at one
point and they don't generate wakeup events.  I'm not sure, though, why this
is related to power resources.

Can you please send a dmesg boot log and the output of acpidump from the
affected machine?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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