Messages in this thread | | | Date | Mon, 19 Oct 2009 11:08:56 -0400 (EDT) | From | Alan Stern <> | Subject | Re: 2.6.31.4: USB/UPS connectivity issue on Intel DP55KG Motherboard [DEBUG logs included upsd/upsmon/usbhid-ups] |
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On Sun, 18 Oct 2009, Justin Piszcz wrote:
> Thanks Alan, > > I have performed all of the steps you recommended, there is also a bug in > the docs, the directory seems to be different, or at least if you have > everything compiled into the kernel and not using modules.
> Start nut: > # /etc/init.d/nut start > Starting Network UPS Tools: upsdrvctl upsd upsmon. > > Within ~20-30 seconds it already broke: > ============================================================================ > Broadcast Message from nut@p34.internal.lan > (somewhere) at 17:22 ...
Well, the usbmon trace shows that wherever the problem lies, it isn't in the kernel. There were a few problems in the device itself -- it was queried for a report and did not provide any data. The nut program should be smart enough to retry when this happens, but it didn't.
It did try to re-establish communcation with the device, but it appears that nut got caught in a loop during this attempt. During this loop nut did nothing but transfer a bunch of string descriptors from the device, over and over again at 2-second intervals. The loop lasted for almost a minute, until another device error occurred. Then nut recovered properly -- until a third error happened and nut got stuck in its loop again.
Alan Stern
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