when i boot with acpi=off or acpi=ht i see this in dmesg:

[    0.192012] PnPBIOS: Found PnP BIOS installation structure at 0xc00f8410
[    0.192012] PnPBIOS: PnP BIOS version 1.0, entry 0xf0000:0xc5b6, dseg 0x400
[    0.192012] PNPBIOS fault.. attempting recovery.
[    0.192012] PnPBIOS: Warning! Your PnP BIOS caused a fatal error. Attempting 
to continue
[    0.192012] PnPBIOS: You may need to reboot with the "pnpbios=off" option to 
operate stably
[    0.192012] PnPBIOS: Check with your vendor for an updated BIOS
[    0.192012] PnPBIOS: get_dev_node: unexpected status 0x37
[    0.192012] PnPBIOS: 0 nodes reported by PnP BIOS; 0 recorded by driver

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linux-image-2.6.26-4-generic fails to boot on Acer Extensa 4420 5963
https://bugs.launchpad.net/bugs/252041
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