On Fri, 4 Mar 2016, Devon Ash wrote: > Failing that, can you at least provide a usbmon trace showing what > happens when you plug a device into one of the bad ports? > > usbmon trace: > > I'm unable to get anything from doing "cat 0u && cat 5u && cat 6u" > (which are all of the offending devices locations) Is CONFIG_USB_MON set? If it is set to M, have you loaded the usbmon module? > And also a > dmesg log with USB debugging enabled? > > dmesg shows nothing. I htink I'm missing something - to enable USB > debugging all that needs to be done is mount the debugfs right? No, that's not enough. I don't remember how 3.19 does it, but with more modern kernels you have to enable dynamic debugging by doing: echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control That's assuming CONFIG_DYNAMIC_DEBUG is set, which it should be in a typical distribution kernel. > Regarding Kernel 4.2.0-30-lowlatency, > > system-udevd is now giving me the outputs on boot: > > seq 1106 '/devices/pci0000:00/0000:00:1a.0/usb5 killed (same for usb6) > reason being ; a timeout > > Then I start to get > > usb 5-1: device not accepting address 5, error -110 > usb usb5-port1; unable to enumerate USB device > > and the same for usb6. > > There is also: > > system-udevd: worker terminated by signal 9, and then the system waits > for 2-5 minutes, finishing with a kernel hang and a stack trace "not > tainted, blocked for more than 120 seconds" Can you post the actual dmesg log? > here is the output of: > > sudo mount -t usbfs none /proc/bus/usb > > mount: mounting none on /proc/bus/usb failed: no such file or directory There no longer is any such thing as a usbfs filesystem. Instead there are USB device nodes under /dev/bus/usb. > cat /proc/bus/usb/devices: no such file or directory > > sudo mount -t debugfs none /sys/kernel/debug > > mount: muonting none on /sys/kernel/debug failed: Device or resource busy Probably because it's already mounted there. > As well, all usbmon outputs are returning me nothing when plugging > in/out the broken USB ports that are in question What is the full path of the files you are watching for usbmon? They should be things like /sys/kernel/debug/usb/usbmon/5u -- which of course won't exist unless debugfs is properly mounted and usbmon is properly loaded. 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
