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

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Date:	Fri, 22 Feb 2013 22:51:58 +0100
From:	Fabio Baltieri <fabio.baltieri@...aro.org>
To:	Dave Jones <davej@...hat.com>
Cc:	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,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-acpi@...r.kernel.org
Subject: Re: [GIT PATCH] USB patches for 3.9-rc1

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

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!

Fabio

-- 
Fabio Baltieri
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