Alan Stern wrote:
You can probably get more information if you turn on the USB debugging option in the kernel configuration.
Here's what happens with ehci_hcd verbose debugging enabled:
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 1 status 001000 POWER sig=se0
Oct 14 14:55:52 tbolt kernel: hub.c: port 1, portstatus 100, change 0, 12 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 2 status 003002 POWER OWNER sig=se0 CSC
Oct 14 14:55:52 tbolt kernel: hub.c: port 2, portstatus 0, change 1, 12 Mb/s
Oct 14 14:55:52 tbolt kernel: hub.c: port 2 connection change
Oct 14 14:55:52 tbolt kernel: hub.c: port 2, portstatus 0, change 1, 12 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 3 status 001000 POWER sig=se0
Oct 14 14:55:52 tbolt kernel: hub.c: port 3, portstatus 100, change 0, 12 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 4 status 001000 POWER sig=se0
Oct 14 14:55:52 tbolt kernel: hub.c: port 4, portstatus 100, change 0, 12 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001803 POWER sig=j CSC CONNECT
Oct 14 14:55:52 tbolt kernel: hub.c: port 5, portstatus 501, change 1, 480 Mb/s
Oct 14 14:55:52 tbolt kernel: hub.c: port 5 connection change
Oct 14 14:55:52 tbolt kernel: hub.c: port 5, portstatus 501, change 1, 480 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001801 POWER sig=j CONNECT
Oct 14 14:55:52 tbolt kernel: hub.c: port 5, portstatus 501, change 0, 480 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001801 POWER sig=j CONNECT
Oct 14 14:55:52 tbolt kernel: hub.c: port 5, portstatus 501, change 0, 480 Mb/s
Oct 14 14:55:52 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001801 POWER sig=j CONNECT
Oct 14 14:55:52 tbolt kernel: hub.c: port 5, portstatus 501, change 0, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001801 POWER sig=j CONNECT
Oct 14 14:55:53 tbolt kernel: hub.c: port 5, portstatus 501, change 0, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: port 5 reset
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001101 POWER sig=se0 RESET CONNECT
Oct 14 14:55:53 tbolt kernel: hub.c: port 5, portstatus 511, change 0, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: hub.c: port 5 of hub 1 not reset yet, waiting 10ms
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001101 POWER sig=se0 RESET CONNECT
Oct 14 14:55:53 tbolt kernel: hub.c: port 5, portstatus 511, change 0, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: hub.c: port 5 of hub 1 not reset yet, waiting 10ms
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: port 5 high speed
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001005 POWER sig=se0 PE CONNECT
Oct 14 14:55:53 tbolt kernel: hub.c: port 5, portstatus 503, change 10, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: hub.c: new USB device 00:1d.7-5, assigned address 2
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: irq status 0002 ERR
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: devpath 5 ep0out 3strikes
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: dev0 ep0out qtd token 00080248 --> status -71
Oct 14 14:55:53 tbolt kernel: usb.c: USB device not accepting new address=2 (error=-71)
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: free_config 5 devnum -1
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: free_config, async ep 0x00 qh f7caf080<7>ehci_hcd 00:1d.7: irq status 0020 IAA
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: port 5 reset
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: port 5 high speed
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 5 status 001005 POWER sig=se0 PE CONNECT
Oct 14 14:55:53 tbolt kernel: hub.c: port 5, portstatus 503, change 10, 480 Mb/s
Oct 14 14:55:53 tbolt kernel: hub.c: new USB device 00:1d.7-5, assigned address 3
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: irq status 0002 ERR
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: devpath 5 ep0out 3strikes
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: dev0 ep0out qtd token 00080248 --> status -71
Oct 14 14:55:53 tbolt kernel: usb.c: USB device not accepting new address=3 (error=-71)
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: free_config 5 devnum -1
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: free_config, async ep 0x00 qh f7caf080<7>ehci_hcd 00:1d.7: irq status 0020 IAA
Oct 14 14:55:53 tbolt kernel: ehci_hcd 00:1d.7: GetStatus port 6 status 001000 POWER sig=se0
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