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

From: Fabio Baltieri
Date: Fri Feb 22 2013 - 16:52:17 EST

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 Baltieri
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