Dear List, Alan On Wed 070704, Alan Stern wrote: > On Wed, 4 Jul 2007, Karl Kiniger wrote: > > > Dear list, > > > > I am trying to identify a USB related hardware > > fault/instability on a few of our ultrasound machines. > > > > Question: what known misbehaviours do exist for > > a USB device on a given root hub port to affect other USB hardware > > connected to other root hub ports? (cause it to become disabled etc) > > Depending on the controller, an overcurrent could do it. But your log > doesn't show anything like that. Perhaps other electrical errors, like > a bad impedance, could have some effect.
I will be away for about two weeks (fortunately holidays :-) but will have to continue on that problem when I am back.. I appreciate your response and I am sure it is a hardware problem. There are several hundreds of these machines out in the field and only a few are showing these kinds of problem - some do it once per week and others do it several times per day. Not all machines hat a total USB breakdown like this one though. A likely candidate is the USB<>IDE DVD drive, another is the Sony printer at root hub port 7 - and of course the whole user interface behind the 4 port hub. We already replaced the main board. Yesterday evening it happened while I was sitting close to the machine - unfortunately w/o PS2 keyboard. So I removed first the user interface and plugged in a Cherry USB kbd which is known to work - errors -71 and did not work. Then user interface plug into another machine - worked fine. Unplugged USB<>IDE - still no luck with the external USB kbd. When I powered off the Sony Printer at port 7 suddenly the external USB kbd worked. Powered Sony printer on again - all still worked. Replugged everything to the original root hub ports - all worked fine. When doing the unplugging game two days ago it was the empty 7 port hub on root hub port 2 which brought life back into the USB. Since then the test is running for more than 24 hours w/o any unusual log display. I would really want to know how to design a bad USB device which is capable to bring the whole USB down - I tried already with overcurrent etc but this all affected only the one port I played with. Additional ideas are highly appreciated. Greetings, Karl > > > /: 05.P1: ROOT_HUB, uhci_hcd/2p, 12M > > /: 04.P1: ROOT_HUB, uhci_hcd/2p, 12M > > /: 03.P1: ROOT_HUB, uhci_hcd/2p, 12M > > /: 02.P1: ROOT_HUB, uhci_hcd/2p, 12M > > /: 01.P1: ROOT_HUB, ehci_hcd/8p, 480M > > |_ P1: If0, VEND., , 480M 17d1:0301:0.01 > > |_ P2: If0, HUB, /7p, 480M 04cc:1521:2.00 > > |_ P5: If0, HUB, /7p, 480M 04cc:1521:2.00 > > |_ P4: If0, stor., , 480M 04b4:6830:0.01 USB to IDE <-- DVD > > drive, also disappeared > > |_ P6: If0, HUB, /4p, 480M 05bd:6560:0.07 <-- this is > > actually a Cypress hub. all disappeared > > |_ P1: If0, HID, , 1.5M 05bd:0001:1.00 GE USnd, Extended Keyboard V83 > > |_ P2: If0, >ifc, , 480M 1731:0002:3.00 ArtistaUSB 640 <-- USB > > graphics display > > |_ P2: If1, >ifc, , 480M 1731:0002:3.00 <-- + touch > > screen panel > > |_ P3: If0, HID, , 1.5M 05bd:0200:0.00 GE USnd, Alphanumeric Keyboard > > |_ P4: If0, HID, , 1.5M 0782:0002:0.00 USB Trackerball > > |_ P7: If0, print, , 480M 054c:0159:1.10 USB Printer <-- Sony, > > this one disappeared too > > |_ P8: If0, print, , 480M 054c:01e7:1.00 UP-D897 <-- also Sony [ lots of lines deleted ] > > Alan Stern -- Karl Kiniger mailto:[EMAIL PROTECTED] GE Medical Systems Kretztechnik GmbH & Co OHG Tiefenbach 15 Tel: (++43) 7682-3800-710 A-4871 Zipf Austria Fax: (++43) 7682-3800-47 ------------------------------------------------------------------------- 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
