After testing many times,I found that it is due to irqpoll.But without
irqpoll,Usb on thinkpad will behave incorrectly.Failed network
connecting and usb mouse lagging.It should happen on all laptops which
use i810/i830 chip(R31 is i830).

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[gutsy] very slow booting
https://bugs.launchpad.net/bugs/155039
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