Re: Unreliable USB3 with NEC uPD720200 and Delock Cardreader

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On Mon, Nov 26, 2012 at 10:48:03PM +0100, Bjørn Mork wrote:
> Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> writes:
> 
> > It looks like both Ulrich and Andrew have the same issue.  I also have a
> > Lenovo x220, and I confirmed that when I turn on PCI runtime suspend,
> > the NEC host controller does not report port status changes when a new
> > USB device is plugged in.
> >
> > I'm running 3.6.7, and I'm pretty sure that runtime suspend worked for
> > the NEC host on some older kernel.  I don't think the NEC host went into
> > D3cold on that kernel, though.  Is there a way to disable D3cold and
> > just use D3hot instead?
> 
> Yes, you have /sys/bus/pci/devices/.../d3cold_allowed
> See Documentation/ABI/testing/sysfs-bus-pci
> 
> If this really is a problem with the D3cold support that went into 3.6
> then I guess you should include Huang Ying in the discussions as well
> (CCed).

Turning off D3 cold didn't help.  Once the PCI device is suspended,
connect events do not generate an interrupt.

I'll go see if I can figure out which kernel this worked on and bisect.

Sarah Sharp
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