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When reconnecting a USB keyboard to my system, I got this stream of messages in /var/log/syslog:

Mar 31 22:35:01 gatsby kernel: [442633.491562] usb 2-1.2: new low speed USB device using ehci_hcd and address 79
Mar 31 22:35:01 gatsby kernel: [442633.579057] ehci_hcd 0000:00:1d.0: fatal error
Mar 31 22:35:01 gatsby kernel: [442633.585381] ehci_hcd 0000:00:1d.0: force halt; handshake ffffc90000674824 00004000 00004000 -> -110
Mar 31 22:35:01 gatsby kernel: [442633.585389] ehci_hcd 0000:00:1d.0: HC died; cleaning up
Mar 31 22:35:01 gatsby kernel: [442633.598955] usb 2-1.2: device descriptor read/all, error -108
Mar 31 22:35:01 gatsby kernel: [442633.598961] hub 2-1:1.0: cannot disable port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598974] hub 2-1:1.0: cannot reset port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598977] hub 2-1:1.0: cannot disable port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598983] hub 2-1:1.0: cannot reset port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598987] hub 2-1:1.0: cannot disable port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598992] hub 2-1:1.0: cannot reset port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598995] hub 2-1:1.0: cannot disable port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.598998] hub 2-1:1.0: unable to enumerate USB device on port 2
Mar 31 22:35:01 gatsby kernel: [442633.599002] hub 2-1:1.0: cannot disable port 2 (err = -19)
Mar 31 22:35:01 gatsby kernel: [442633.599015] usb 2-1: USB disconnect, address 2

A normal set of log messages for the same event looks like this:

Mar 31 16:36:44 gatsby kernel: [421175.156518] usb 2-1.2: new low speed USB device using ehci_hcd and address 74
Mar 31 16:36:44 gatsby kernel: [421175.278006] input: Dell Dell USB Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/2-1.2:1.0/input/input63
Mar 31 16:36:44 gatsby kernel: [421175.278256] generic-usb 0003:413C:2003.0038: input,hidraw0: USB HID v1.10 Keyboard [Dell Dell USB Keyboard] on usb-0000:00:1d.0-1.2/input0

Since that error was logged, the system will no longer respond to the connection of USB devices. There is no record of these events in either /var/log/syslog or via dmesg.

I'm running 10.10 on an Acer Aspire 5742 laptop. It may be relevant that both my HECI controller and SMBus show up as UNCLAIMED in the output from lshw. They are both listed as being /^\s*product: 5 Series/3400 Series Chipset (HECI|SMBus) Controller/.

I'm booting with the acpi_osi= kernel argument.

I'd like to know how I can

  • recover from such situations without rebooting the machine
  • prevent these problems from occurring in the first place.

update

I tried

$ sudo modprobe -r usbhid ; sudo modprobe usbhid

This logged the following to /var/log/syslog

Apr  1 00:41:10 gatsby kernel: [450189.768916] usbcore: deregistering interface driver usbhid
Apr  1 00:41:10 gatsby kernel: [450189.768960] usbcore: deregistering interface driver hiddev
Apr  1 00:41:10 gatsby kernel: [450189.823210] usbcore: registered new interface driver hiddev
Apr  1 00:41:10 gatsby kernel: [450189.823246] usbcore: registered new interface driver usbhid
Apr  1 00:41:10 gatsby kernel: [450189.823250] usbhid: USB HID core driver

but otherwise had no effect: newly-connected USB devices still do not work, nor are any syslog messages generated in response to their connection.

I tried connecting devices to two different USB ports on different sides of the machine, both to the same non-effect.

update 2

Posted an Ubuntu Question on launchpad.net with the same content.

update 3: 2011-12-13

This has not happened to me in months. I haven't attempted to resolve the issue; either it stopped happening because of a system update, or I've just been lucky and not had an occurrence. I am still using Ubuntu 10.10. Another user mentions having "the same problem" in an answer which should be a comment and should be removed.

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Hello, this question has no information and activity for a very long time. I am voting to close it for now. If by any reason you think this question is still viable or useful in anyways or that there is still a good chance it will be answered please flag it to a moderator or add a comment with the reasons why you want it open. Regards. –  bodhi.zazen Feb 26 '12 at 4:02
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closed as too localized by bodhi.zazen, Marco Ceppi Feb 26 '12 at 14:53

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