* Alan Stern <[EMAIL PROTECTED]> wrote: > > I've noticed a strange USB disconnect of an external HDD. There's > > several USB devices connected to this machine at all times, > > mostly hubs, but some directly connected HDD gets hit by this > > issue. > > > > It's reproducable under normal usage; tho I'm not sure what > > triggers it. It has happened both while accessing the HDD and > > during idle times. For what it matters, I replaced the HDD > > enclosure of a cypress chipset with a genesys logic one... > > doesn't matter. > > > > 2.6.23-rcX (this one is rc7) > > > > dmesg output: > > > > hub 1-0:1.0: state 7 ports 8 chg 0000 evt 0010 ehci_hcd > > 0000:00:02.2: GetStatus port 4 status 001002 POWER sig=se0 CSC > > hub 1-0:1.0: port 4, status 0100, change 0001, 12 Mb/s usb 1-4: > > USB disconnect, address 3 > > That was the disk disconnecting. Pretty much everything that > follows is irrelevant: We don't need to know what happened _after_ > the drive disconnected -- we need to know what happened _before_ > (i.e., what caused the disconnect). > > A usbmon trace would be helpful. See the instructions in > Documentation/usb/usbmon.txt.
Did that ... nada. But I tracked this annoying problem down anyway. It turned out it was solely hardware-related; I used the additional USB-port connectors on the motherboard (cable->slot) and these little buggers feature a pretty weak power supply. It's ok if a self-powered hub is connected to them, but if a device even demands 100 mA it borks (f.e. my old webcam). Chipset is nvidia (CK8S USB Controller). -- left blank, right bald
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