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halting thinkpad with lid closed.

If I use "halt" to turn off my Thinkpad 560X, and the lid is open,
it works just fine and automatically turns off the power via APM.

However, if the lid is closed and I try to turn it off (via serial
terminal), it doesn't cut off the power but instead
beeps for a few times and when I open the lid to look the screen,
it looks like the shutdown-sequence terminated normally and the
screen says "power off" --- but nevertheless the power doesn't
go off but the hard disk just keeps spinning.

I used tpctl to disable suspend when the lid is closed.

Any cure? I'm using Potato with 2.2.20 kernel.

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