On Fri, 25 May 2007, Juergen Botz wrote: > I have a machine I hadn't used in a while and just installed > Ubuntu 7.04 on which is displaying the following weird problem... > Some time within 24 or 48 hours of booting the whole USB sub- > system apears to simply "shut down". dmesg shows only an > "orderly" disconnect of all USB devices, i.e.: > > kern.log.0:May 7 02:18:27 nova kernel: [65939.522101] usb 4-2.1: USB > disconnect, address 3 > kern.log.0:May 7 02:18:28 nova kernel: [65939.522104] usb 4-2.1.1: USB > disconnect, address 5 > kern.log.0:May 7 02:18:28 nova kernel: [65939.522383] usb 4-2.1.3: USB > disconnect, address 6 > kern.log.0:May 7 02:18:28 nova kernel: [65939.522687] usb 4-2.6: USB > disconnect, address 4 > kern.log.0:May 7 02:18:28 nova kernel: [65939.522690] usb 4-2.6.1: USB > disconnect, address 7 > kern.log.0:May 7 02:18:28 nova kernel: [65939.522774] usb 4-2.6.2: USB > disconnect, address 8
This log doesn't show an orderly disconnect of all USB devices -- only the devices below 4-2 (a hub). > But nothing had been physically disconnected, and in fact this > has happened some times in the middle of the night. After this > happens, physically disconnecting and reconnecting the devices > does nothing. > > Suspecting faulty USB hardware on the mainboard, I installed a > PCI USB card and plugged everything into that, but I'm getting > the same behavior. > > What could be causing this? How can I debug it further? Maybe the 4-2 hub is misbehaving. Try removing it. Try attaching it to a different computer. Alan Stern ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
