Maciej,
Older PC's require this kernel boot option. Early in ACPI development many PCs
didn't support ACPI and many that did implemented their own individual ACPI
frameworks. Consequently, if the kernel discovers an older PC (I can't recall
the cut-off date now) it disables ACPI by default. Gutsy & Hardy warn about
this at boot time.
If you had this issue on a newer PC it may indicate that BIOS is not presenting
it's date and other information correctly.
Clearly, you found that you must force the kernel to use ACPI and
fortunately it is a usable ACPI.
This is a check to see if you are happy for this bug report to now be closed.
Thanks.
** Changed in: linux-source-2.6.20 (Ubuntu)
Status: New => Incomplete
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/proc/acpi does not exists
https://bugs.launchpad.net/bugs/106400
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