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

From: Rafael J. Wysocki
Date: Fri Feb 22 2013 - 19:12:39 EST

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?


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