This bug also effects me. I have a MacBook Pro 3,1 ; karmic ( 9.10 ) ;
kernel 2.6.32.4

dmesg output:
[22717.854544] appletouch: OVERFLOW with data length 64, actual length is 0
[22717.954191] hub 7-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
[22717.954200] usb 7-2: USB disconnect, address 9
[22717.974536] input: appletouch disconnected
[22718.184145] usb 7-2: new full speed USB device using uhci_hcd and address 10
[22718.564161] usb 7-2: configuration #1 chosen from 1 choice
[22718.574448] input: Apple Computer Apple Internal Keyboard / Trackpad as 
/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.0/input/input33
[22718.574554] apple 0003:05AC:021A.0014: input,hidraw1: USB HID v1.11 Keyboard 
[Apple Computer Apple Internal Keyboard / Trackpad] on usb-0000:00:1d.2-2/input0
[22718.579377] appletouch: Geyser mode initialized.
[22718.579441] input: appletouch as 
/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.1/input/input34
[22718.595369] input: Apple Computer Apple Internal Keyboard / Trackpad as 
/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.2/input/input35
[22718.595444] apple 0003:05AC:021A.0015: input,hidraw2: USB HID v1.11 Device 
[Apple Computer Apple Internal Keyboard / Trackpad] on usb-0000:00:1d.2-2/input2
[22775.126251] input: appletouch disconnected
[22775.228118] usb 7-2: reset full speed USB device using uhci_hcd and address 
10
[22775.375300] appletouch: Geyser mode initialized.
[22775.375402] input: appletouch as 
/devices/pci0000:00/0000:00:1d.2/usb7/7-2/7-2:1.1/input/input36
[22777.704261] usb 7-2: USB disconnect, address 10
[22777.727277] input: appletouch disconnected

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keybord lose usb connection
https://bugs.launchpad.net/bugs/395568
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