Same problem here. It was perfectly working in previous Ubuntu releases.
Problem started after Karmic.
I can not even boot up machine without setting "acpi=off" in grub configuration
Short Info:
Hardware:
Toshiba X200-15K
uname -a
Linux pulsar 2.6.31-17-generic #54-Ubuntu SMP Thu Dec 10 17:01:44 UTC 2009
x86_64 GNU/Linux
BIOS Information
Vendor: TOSHIBA
Version: V2.50
Release Date: 06/11/2008
Address: 0xE5650
Runtime Size: 108976 bytes
ROM Size: 64 kB
Characteristics:
ISA is supported
PCI is supported
PC Card (PCMCIA) is supported
PNP is supported
BIOS is upgradeable
BIOS shadowing is allowed
ESCD support is available
Boot from CD is supported
ACPI is supported
USB legacy is supported
AGP is supported
BIOS boot specification is supported
Targeted content distribution is supported
BIOS Revision: 2.80
Firmware Revision: 2.80
** Attachment added: "uname&lspci&dmidecode outputs"
http://launchpadlibrarian.net/37853510/acpi-problem.tar
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Computer won't boot without acpi=off option
https://bugs.launchpad.net/bugs/386272
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