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Date: Wed, 6 Jul 2011 10:52:02 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: Valdis.Kletnieks@...edu cc: linux-kernel@...r.kernel.org, <linux-usb@...r.kernel.org> Subject: Re: Weird USB over-current messages in recent kernels... On Tue, 5 Jul 2011 Valdis.Kletnieks@...edu wrote: > Seen during boot the last few days on my laptop: > > running 3.0.0-rc4-mmotm0622: > Jul 2 13:08:37 turing-police kernel: [ 2.788108] hub 2-0:1.0: over-current condition on port 1 > Jul 2 13:08:37 turing-police kernel: [ 2.990088] hub 2-0:1.0: over-current condition on port 2 > Jul 2 13:08:37 turing-police kernel: [ 3.193073] hub 6-0:1.0: over-current condition on port 1 > Jul 2 13:08:37 turing-police kernel: [ 3.395088] hub 6-0:1.0: over-current condition on port 2 > > running 3.0.0-rc5-mmotm0630: > Jul 5 09:43:36 turing-police kernel: [ 203.686082] hub 6-0:1.0: over-current condition on port 1 > Jul 5 09:43:36 turing-police kernel: [ 203.969179] hub 6-0:1.0: over-current condition on port 2 > Jul 5 09:43:36 turing-police kernel: [ 204.217077] hub 6-0:1.0: over-current condition on port 1 > > The problem? I don't see any devices that would *cause* the condition: > The device 5 and 6 on bus 1 are attached to the docking station, the Jul 2 boot > was undocked and those two devices weren't present. Nobody home on bus 2 or 6 > at any time, as far as I can tell. > > Any ideas? That message was added recently, which may explain why you haven't seen it before. For more debugging, please collect a usbmon log for bus 2 or bus 6 (see Documentation/usb/usbmon.txt). In fact, you might try doing this for an earlier kernel as well. It may be that your host controllers claim that an over-current condition exists when it really doesn't, or it may be that those ports are wired incorrectly and really do have an over-current condition. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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