On Sun, 31 May 2015, Quentin Deldycke wrote: > Hi, > > On a asrock Z97 Extreme 6 motherboard, the system provides: > - 6 usb3 port in backplate > - 1 usb (2-3? i don't know) port on the board near power switch > - 2 usb sockets (to be used with brackets) on the board near power switch > - in my case, they are both used with usb2-double port brackets > > > While all ports seems to be working, back in motherboard, front panel, > back panel and inside port, dmesg repeat at usb start this message > (boot or via reactivating xhci_hcd): > > [66982.352959] usb 3-9: device descriptor read/all, error -110 > [66982.464943] usb 3-9: new high-speed USB device number 4 using xhci_hcd > [66992.590023] usb 3-9: device descriptor read/all, error -110 > [66992.701970] usb 3-9: new high-speed USB device number 5 using xhci_hcd > [66997.716538] usb 3-9: device descriptor read/8, error -110 > [67002.835034] usb 3-9: device descriptor read/8, error -110 > [67003.050912] usb 3-9: new high-speed USB device number 6 using xhci_hcd > [67008.065506] usb 3-9: device descriptor read/8, error -110 > [67013.184035] usb 3-9: device descriptor read/8, error -110 > [67013.287998] usb usb3-port9: unable to enumerate USB device This looks like a broken USB device plugged into the controller. Or a broken termination for a non-connected port, or something similar. > While the last message have not appeared, the other usb devices are > not activated. After the last message all usb devices unlock in less > than a second. > This means: > - computer start really fast > - but i can log in only after ~30 seconds because of usb keyboard not detected > > This bug apply for all recent debian kernels (3.16, 3.18, 4.0, 4.1...) > (windows also have problem with a "unknown usb device"). > > I would know if it is possible: > - to disable usb3 port9 from kernel command line (so it won't try to > poll it and unlock the other ones faster) In theory it is possible to do this. But the kernel doesn't support it currently. > Note: > - usb3 have other devices plug into without problems. I don't even > know if usb3-port9 is a real usb port... > - all plugged devices work correctly > - problem occur also with no usb devices plug in > - if the bios option to enable usb2 devices on usb3 port is activated, > the bios freeze for 30s also before grub... So i think it is hardware > related... It is _definitely_ hardware related. Alan Stern -- 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
