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Date: Wed, 13 Oct 2010 19:01:09 +0300 From: Tõnu Samuel <tonu@....ee> To: linux-kernel <linux-kernel@...r.kernel.org> Cc: tonu@....ee Subject: BUG: USB3.0 µPD720200 complains about over-current Hi! I know, this is place where only Gods speak and others not. But I am sure there is something odd I found and someone here can take care of it. In situation when nothing is connected to any USB ports Ubuntu 10.04.1 stock kernel complains: spider@...der:~$ zcat /var/log/kern.log.2.gz | grep -i current | head Sep 29 23:30:12 spider kernel: [ 9.048388] hub 8-0:1.0: over-current change on port 1 Sep 29 23:30:12 spider kernel: [ 9.152036] hub 8-0:1.0: over-current change on port 2 Sep 29 23:30:12 spider kernel: [ 9.256038] hub 8-0:1.0: over-current change on port 3 Sep 29 23:30:12 spider kernel: [ 9.360037] hub 8-0:1.0: over-current change on port 1 Sep 29 23:30:12 spider kernel: [ 9.464036] hub 8-0:1.0: over-current change on port 2 Sep 29 23:30:12 spider kernel: [ 9.570621] hub 8-0:1.0: over-current change on port 3 Sep 29 23:30:12 spider kernel: [ 9.672037] hub 8-0:1.0: over-current change on port 1 Sep 29 23:30:12 spider kernel: [ 9.776038] hub 8-0:1.0: over-current change on port 2 Sep 29 23:30:12 spider kernel: [ 9.880049] hub 8-0:1.0: over-current change on port 3 Sep 29 23:30:13 spider kernel: [ 9.984041] hub 8-0:1.0: over-current change on port 1 spider@...der:~$ This runs forever and makes computer busy forever just running those messages. I verified same behavior exists with vanilla 2.6.35.7. Disabling USB3.0 in BIOS turns off problem and all USB2 ports remain to work. So probably this is xHCI driver who complains. I looked bit around in source and see it is copied from USB2 code and possibly USB3 has something different. I've read USB3 can supply more power, so possibly something here has changed. My hardware: Motherboard ASUS M4A88T-I Deluxe http://www.asus.com/product.aspx?P_ID=jGAoIFEziW5sPYy7 it has USB3 chip "NEC D720200F1" on it: http://digi.physic.ut.ee/mw/images/d/de/20100926_digi_007.png NEC is joined Renesas, so this is his link for datasheet etc: http://www2.renesas.com/usb/en/product/upd720200.html If you propose patch, I can give him test run. Tõnu -- 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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