On Sunday, June 24, 2012, Rich Wrenn wrote: > I am seeing some problems when using the Powerware 5115 UPS when connected > to the Patsburg USB controller and would like to know if anyone has a > solution.**** > > ** ** > > The symptom is that PING messages sent to the bcmxcp_usb driver take as > long as 25 seconds to complete.**** > > ** ** > > The configuration is a Romley patform (a.k.a., Sandy Bridge + Patsburg) > running Debian 6 with 2.6.39 kernel with NUT 2.6.4 in which the Powerware > is connected via USB 2.0 to the Patsburg.**** > > ** ** > > Of note is that the following messages are logged in syslog frequently.*** > * > > 2012-06-21T09:03:10.754413+00:00 (none) kernel: [ 8659.067243] usb 2-1.4: > usbfs: USBDEVFS_CONTROL failed cmd bcmxcp_usb rqt 66 rq 13 len 4 ret -110* > *** > > I believe that these indicate that the USB driver is timing out USB > messages to the UPS. > > **** > That sounds about right. Unfortunately, the root cause could conceivably be anything from bad silicon to dropped interrupts to a flaky cable or jack.
> The identical setup running on a Westmere + Tylersburg + ICH10R works fine > but on that platform the USB connection is USB 1.1.**** > > ** ** > When you say that it is USB 1.1 here, is the other system connecting at a higher speed? Even with USB 2.0 controllers, most HID products (keyboard, mouse, UPS) will generally only connect at 1.5 Mbit/sec, since the device-side circuitry for that is much simpler. The kernel messages from when the UPS is plugged in should mention the speed. I know it sounds like snake oil, but try swapping the USB cable for a known good one. If not, it might be a kernel driver issue. Sorry it's a vague answer, but a more detailed analysis would probably need to be done by the engineers who built the UPS. -- - Charles Lepple
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