I can reproduce this on a Lenovo Thinkpad x100e
Disconnecting the AC Power freezes the system.
Booting on battery power works until the login screen, then freezes as well.
Setting acpi=off at boot time didn't work the first time I tried a few days ago
but i will retest that.
Toggling display brightness via hotkeys or power manager freezes the system as
well, but i think that has something to do with thinkpad_acpi not yet
supporting the x100e model ("not yet supported thinkpad detected")
http://sourceforge.net/mailarchive/forum.php?thread_name=20100316230950.GA30415%40khazad-dum.debian.net&forum_name=ibm-acpi-devel
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10.04 beta1 hangs on switch to battery // ACPI PROBLEM // maybe kernel Problem
https://bugs.launchpad.net/bugs/545508
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