when I plug a usb 3 device on a usb 3 port on devuan, I have only this message from dmesg :

[354063.866359] usb 1-4: new high-speed USB device number 10 using xhci_hcd
[354064.050880] usb 1-4: New USB device found, idVendor=1f75, idProduct=0916
[354064.053295] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[354064.055350] usb 1-4: Product: USB DISK
[354064.057197] usb 1-4: Manufacturer:  
[354064.059019] usb 1-4: SerialNumber: 13072956011033
[354064.061503] usb-storage 1-4:1.0: USB Mass Storage device detected
[354064.064271] scsi host9: usb-storage 1-4:1.0
[354086.410552] usb 1-4: reset high-speed USB device number 10 using xhci_hcd

with no block device created neither in /dev or /sys. I have no problem if I plug it on a usb2 port. I have the same problem on Windows® It also works if I plug an usb2 device on a usb3 or 3.1 port (because it is loaded through the usb2 driver).

I tried :

for i in /sys/bus/usb/devices/*/power/autosuspend;
do echo 2 > $i;
for foo in /sys/bus/usb/devices/*/power/level;
do echo on > $foo;

But it had no effects. I also noticed usb2 flash drives on usb2 ports were also loaded with xhci_hcd.

My Linux kernel version being 4.5.0-0.bpo.1-amd64 how to enjoy usb3 speed with a usb3 flash disk on Linux ?

  • udevadm monitor the udev events for both usb2 and usb3 ports. If they are different, look at the udev rules, and find out why the usb3 event is not matched. – dirkt Nov 14 '16 at 17:16
  • @dirkt : I don’t think this is related to udev. There’s no block device data corresponding to my usb flash disk under/sys. – user2284570 Nov 14 '16 at 17:20
  • Overlooked /sys, and also overlooked the reset. Hardware problem? – dirkt Nov 14 '16 at 17:22
  • @user2284570, is this Windows on the same machine/hardware? – Ale..chenski Nov 14 '16 at 18:18
  • Then it is an obvious suck of devuan driver. It looks like a problem in handling the switch from xHCI (USB3) to HS mode, since the device takes USB2 path. – Ale..chenski Nov 14 '16 at 18:21

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