Hi fellow linux USB users and developers, we've spent lots of time trying to resolve issue with very little progress so I'd like to try asking for help here.. we're migrating big amount of users from SUSE running i386 2.6.13 kernel to x86_64 centos-based system running x86_64 4.4.x kernel (tried 4.13 as well). many machines are deployed with symbol (zebra?) DS6708 barcode readers and after machine boot, it is often not working, either not lit at all, or not scanning correctly. Unplugging/plugging the reader solves the issue. (machines are various types of Lenovo desktops) Our guess is it has something to do with power, as using the ammeter it seems that when the device is not working, it just takes very little current, so maybe it just doesn't "tell" the bus to increase voltage at start? A colleague has developped solution to fix on ehci-hcd managed ports using unbind/bind of the particular device, so we can "fix" it automatically on boot. However it doesn't work/help on other USB buses, ie uhci-hcd or xhci-hcd (this is on new models and was not been used on SUSE at all) Sometimes reloading usb module helps, but sometimes not. My question is, did somebody have/solve similar issue? Is there a way to decrease/increase power in generic way, so I can subsctitute device unplug/plug? Or maybe some even better any better way I could use to solve this issue? There are hundreds of those readers in production, so replacing them is a problem.. If I can provide any further information, please feel free to ask thanks a lot in advance! BR nik -- ------------------------------------- Ing. Nikola CIPRICH LinuxBox.cz, s.r.o. 28.rijna 168, 709 00 Ostrava tel.: +420 591 166 214 fax: +420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: servis@xxxxxxxxxxx ------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
