following up on myself, I would like to add that when compiled with "usb verbose debug"
I notice that with the last-known-working-kernel (on my part) ie 2.6.0-test2
I see that there used to be messages about "debounce" which are now gone...


2.6.5-rc1-mm1:
ohci_hcd 0000:00:01.3: GetStatus roothub.portstatus [1] = 0x00100303 PRSC LSDA PPS PES CCS
usb 2-1: new low speed USB device using address 2
usb 2-1: new device strings: Mfr=1, Product=3, SerialNumber=0
drivers/usb/core/message.c: USB device number 2 default language ID 0x409
usb 2-1: Product: Microsoft 3-Button Mouse with IntelliEye(TM)
usb 2-1: Manufacturer: Microsoft
usb 2-1: registering 2-1:1.0 (config #1, interface 0)
hid 2-1:1.0: usb_probe_interface
hid 2-1:1.0: usb_probe_interface - got id
input: USB HID v1.10 Mouse [Microsoft Microsoft 3-Button Mouse with IntelliEye(T
M)] on usb-0000:00:01.3-1
ohci_hcd 0000:00:01.2: GetStatus roothub.portstatus [2] = 0x00010301 CSC LSDA PPS CCS
hub 1-0:1.0: port 2, status 301, change 1, 1.5 Mb/s
hub 1-0:1.0: debounce: port 2: delay 100ms stable 4 status 0x301
ohci_hcd 0000:00:01.2: GetStatus roothub.portstatus [2] = 0x00100303 PRSC LSDA PPS PES CCS
usb 1-2: new low speed USB device using address 2
usb 1-2: new device strings: Mfr=1, Product=2, SerialNumber=0
drivers/usb/core/message.c: USB device number 2 default language ID 0x409
usb 1-2: Product: Logitech USB Keyboard
usb 1-2: Manufacturer: Logitech
usb 1-2: registering 1-2:1.0 (config #1, interface 0)
hid 1-2:1.0: usb_probe_interface
hid 1-2:1.0: usb_probe_interface - got id
hid: probe of 1-2:1.0 failed with error -5
usb 1-2: registering 1-2:1.1 (config #1, interface 1)
hid 1-2:1.1: usb_probe_interface
hid 1-2:1.1: usb_probe_interface - got id
input: USB HID v1.10 Mouse [Logitech Logitech USB Keyboard] on usb-0000:00:01.2-2



2.6.0-test2:
hub 2-0:0: debounce: port 1: delay 100ms stable 4 status 0x301
Freeing initrd memory: 1430k freed
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 236k freed
hub 2-0:0: new USB device on port 1, assigned address 2
input: USB HID v1.10 Mouse [Microsoft Microsoft 3-Button Mouse with IntelliEye(TM)] on usb-0000:00:01.3-1
hub 1-0:0: debounce: port 2: delay 100ms stable 4 status 0x301
hub 1-0:0: new USB device on port 2, assigned address 2
drivers/usb/core/message.c: string descriptor 0 too short
input: USB HID v1.10 Keyboard [Logitech Logitech USB Keyboard] on usb-0000:00:01.2-2
input: USB HID v1.10 Mouse [Logitech Logitech USB Keyboard] on usb-0000:00:01.2-2


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