It means knoppix found your acpi, but perhaps is hanging for just that reason.

Acpi is used for powersaving, inheriting the job of apm, and may (when it works) save power of devices (cdrom, hdd), control the fan-speed, react on power-button (sleepmode) ...

You may try to boot with 'acpi=off' - option. It's quiete unstable and vendor-dependend.