Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interruptresponses)

From: Alan Stern
Date: Fri Mar 08 2013 - 21:19:49 EST

On Fri, 8 Mar 2013, Peter Hurley wrote:

> [ +linux-usb ]
> On Fri, 2013-03-08 at 14:12 -0500, Shawn Starr wrote:
> > Hello folks,
> >
> > I am noticing since rc0 and now rc1, very poor interrupt handling. Keyboard response, mouse movements, display refreshing etc. General input/display sluggishness. Did something break IRQ handling somewhere? I need to validate if this happens with X not running also if it is i915 related somehow. The behavor is noticed in a console login however.
> >
> > Device: Lenovo W500 laptop
> Hi Shawn,
> Unhandled interrupts is the problem.
> Is the device below being id'd properly?
> If you remove this device, does the problem go away?

Does either of the kernels in question have commit 0f815a0a700b (USB:
UHCI: fix IRQ race during initialization)? That commit was added to
fix precisely this sort of thing.

Alan Stern

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