In some systems, xpad times out during suspend:
[ 4470.773651] xpad 2-1.5:1.6: timed out waiting for output URB to complete, killing
[ 4475.892774] xpad 2-1.5:1.4: timed out waiting for output URB to complete, killing
[ 4481.011717] xpad 2-1.5:1.2: timed out waiting for output URB to complete, killing
[ 4486.130707] xpad 2-1.5:1.0: timed out waiting for output URB to complete, killing
[ 4486.288630] PM: suspend devices took 20.880 seconds
This causes suspend to take a long time to complete. Unloading/reloading
the module during suspend/wakeup successfully works around this issue.