I am not an expert on USB or linux for that matter, although I am currently trying to grop the USB spec so that I can develop a USB devce to attach to the bus. 
 
From what I am looking at, it looks liks you are loosing and reconnecting much more than just you keyboard.  Do you have many USB powered devices plugged in the motherboard?  Is it possible to move them on to a powered USB hub?  Doing this would reduce the load on the 5V supplied by the USB connectors.  This is really a shot in the dark and is somthing I would try only if I had a USB hub laying around.   
 
 
 
On Sat, May 26, 2012, at 10:32 AM, E Johnson wrote:
We have a problem here with keyboard being disconnected many times/day.

If I unplug the USB connector, then plug it in again, this works some of the time, but not always.

If re-plugging it in does not work, then if I plug in the keyboard at a different port, it sometimes starts working again, but not always.

The front USB ports seem a little stretched out; sometimes wiggling the connector temporarily fixes the problem, but not always. The back USB connectors seem nice & snug, but the problem does also happen when plugged in back there.

This is output of lsusb:

Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 007: ID 046d:c062 Logitech, Inc.
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 047f:c002 Plantronics, Inc.
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 085: ID 0566:3013 Monterey International Corp.
Bus 006 Device 084: ID 0566:3020 Monterey International Corp.
Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The keyboard is the Monterey thing, why it's in there two times I have no clue.

Sometimes the keyboard works normally for many days, then this disconnecting problem crops again, seemingly random. I can't identify a specific reason why this starts happening, or stops happening. But it's becoming more frequent now.

I am not finding a solution in the forums (or maybe I am not searching with the right terms).

I am getting zillions of repetitive error messages, a small sample of which is pasted here below.

I had these same kind of messages since several years ago, on a different computer (different processor, mobo, case, mouse, keyboard & all) running an earlier version of my OS (Debian). I get similar messages here in a different computer, different keyboard & mouse, running Debian Squeeze.

This computer is running Debian Lenny.  It is soon to be retired since I just built a brand-new one, but can't retire it until I migrate a whole lot of files to the new one & do some tweaking & installing various apps.

Hope someone here has run across this issue & has found a way to solve it. I can't crawl under the table umpteen times/day to plug in a USB cable. Very frustratiing problem.

Sample of error messages is below here. Ideas, suggestions would be greatly appreciated.

Thanks very much,
Liz J

May 26 09:18:42 leonardo kernel: [3110102.417306] usb 6-2: USB disconnect, address 27
May 26 09:18:42 leonardo kernel: [3110102.417306] usb 6-2.3: USB disconnect, address 28
May 26 09:18:42 leonardo kernel: [3110102.749302] usb 6-2: new high speed USB device using ehci_hcd and address 29
May 26 09:18:42 leonardo kernel: [3110102.901315] usb 6-2: configuration #1 chosen from 1 choice
May 26 09:18:42 leonardo kernel: [3110102.901315] hub 6-2:1.0: USB hub found
May 26 09:18:42 leonardo kernel: [3110102.901315] hub 6-2:1.0: 3 ports detected
May 26 09:18:42 leonardo kernel: [3110103.009359] usb 6-2: New USB device found, idVendor=0566, idProduct=3020
May 26 09:18:42 leonardo kernel: [3110103.009359] usb 6-2: New USB device strings: Mfr=10, Product=11, SerialNumber=0
May 26 09:18:42 leonardo kernel: [3110103.009359] usb 6-2: Product: USB 2.0 HUB
May 26 09:18:42 leonardo kernel: [3110103.009359] usb 6-2: Manufacturer: GENESYS
May 26 09:18:43 leonardo kernel: [3110103.225358] usb 6-2.3: new low speed USB device using ehci_hcd and address 30
May 26 09:18:43 leonardo kernel: [3110103.337358] usb 6-2.3: configuration #1 chosen from 1 choice
May 26 09:18:43 leonardo kernel: [3110103.345360] input: HID 0566:3013 as /class/input/input2619
May 26 09:18:43 leonardo kernel: [3110103.385357] input,hidraw2: USB HID v1.10 Keyboard [HID 0566:3013] on usb-0000:00:13.2-2.3
May 26 09:18:43 leonardo kernel: [3110103.393363] input: HID 0566:3013 as /class/input/input2620
May 26 09:18:43 leonardo kernel: [3110103.437358] input,hiddev97,hidraw3: USB HID v1.10 Device [HID 0566:3013] on usb-0000:00:13.2-2.3
May 26 09:18:43 leonardo kernel: [3110103.437358] usb 6-2.3: New USB device found, idVendor=0566, idProduct=3013
May 26 09:18:43 leonardo kernel: [3110103.437358] usb 6-2.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0
May 26 09:18:47 leonardo kernel: [3110107.977546] usb 6-2: USB disconnect, address 29
May 26 09:18:47 leonardo kernel: [3110107.977546] usb 6-2.3: USB disconnect, address 30
May 26 09:18:48 leonardo kernel: [3110108.269231] usb 6-2: new high speed USB device using ehci_hcd and address 31
May 26 09:18:48 leonardo kernel: [3110108.417539] usb 6-2: configuration #1 chosen from 1 choice
May 26 09:18:48 leonardo kernel: [3110108.421222] hub 6-2:1.0: USB hub found
May 26 09:18:48 leonardo kernel: [3110108.421222] hub 6-2:1.0: 3 ports detected
May 26 09:18:48 leonardo kernel: [3110108.529223] usb 6-2: New USB device found, idVendor=0566, idProduct=3020
May 26 09:18:48 leonardo kernel: [3110108.529223] usb 6-2: New USB device strings: Mfr=10, Product=11, SerialNumber=0
May 26 09:18:48 leonardo kernel: [3110108.529223] usb 6-2: Product: USB 2.0 HUB
May 26 09:18:48 leonardo kernel: [3110108.529223] usb 6-2: Manufacturer: GENESYS
May 26 09:18:48 leonardo kernel: [3110108.749082] usb 6-2.3: new low speed USB device using ehci_hcd and address 32
May 26 09:18:48 leonardo kernel: [3110108.845832] usb 6-2.3: configuration #1 chosen from 1 choice
May 26 09:18:48 leonardo kernel: [3110108.852599] input: HID 0566:3013 as /class/input/input2621
May 26 09:18:48 leonardo kernel: [3110108.904715] input,hidraw2: USB HID v1.10 Keyboard [HID 0566:3013] on usb-0000:00:13.2-2.3
May 26 09:18:48 leonardo kernel: [3110108.913547] input: HID 0566:3013 as /class/input/input2622
May 26 09:18:48 leonardo kernel: [3110108.929554] input,hiddev97,hidraw3: USB HID v1.10 Device [HID 0566:3013] on usb-0000:00:13.2-2.3
May 26 09:18:48 leonardo kernel: [3110108.929554] usb 6-2.3: New USB device found, idVendor=0566, idProduct=3013
May 26 09:18:48 leonardo kernel: [3110108.929554] usb 6-2.3: New USB device strings: Mfr=0, Product=0, SerialNumber=0






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