On Fr, 2019-01-11 at 19:49 +0100, Jan-Marek Glogowski wrote: > > Yup, but the device is just detected if its plugged in on boot / module load. > I now have recompiled 5.0-rc1 with xhci as a module. First of all, is this a regression? Did earlier kernels work? > > If I plug the device after the module is loaded, I get no messages in dmesg. > No devices shows up > If I rmmod xhci_pci + modprobe xhci_pci the device is correctly enumerated and works. > If I re-plug the device again it also doesn't show up again until module "reload". > > The attached dmesg is from a boot with the device plugged in. > > I had some talk with Greg on #kernelnewbies and he suspected a broken port. > > I have no idea if a port can enumerate but not hotplug. > > I meanwhile switched to some other HW (Acer n4660g), which shows the same problem. OK, then we need logs of the failure case. A usbmon trace and dmesg with debugging enabled echo "module xhci_hcd +mfp" > /sys/kernel/debug/dynamic_debug/control echo "module xhci_pci +mfp" > /sys/kernel/debug/dynamic_debug/control echo "module usbcore +mfp" > /sys/kernel/debug/dynamic_debug/control Regards Oliver
