I am running an Acer Travelmate 4652 using Knoppix 5.0.1.

This version will boot fully, but with a black screen unless I use the cheat code acpi=off. Using this code, everything boots normally.

I was under the impression that this is most probably an issue with my notebook. However, I booted with GRML, and noted that acpi works in GRML. I receive the following success messages when booting GRML -

ACPI Bios found, activating modules.
ac battery button container fan hotkey processor thermal video
Starting acpidaemon

If it works under GRML, I'm sure that Knoppix could be fixed so that acpi could work with it also.

Thank you for all of the good work.