You can also try passing "apm=off" or apm=real-mode-poweroff to the kernel during startup. apm=real-mode-poweroff is better because it keeps other apm-features (advanced power managment).
Yesterday I thought I had crashed two computers after using knopixx. One was a Dell Dimension, the other a Dell Optiplex.
On rebooting after using knoppix exactly nothing happened! Quite scary, as none of the computers were mine.
Turns out that the problem was easy to fix, just to pull out the power cable for a few seconds, so everything is fine now.
But I REALLY REALLY REALLY think this problem should be in the FAQ/Documentation! (with large print..)
Dell is a very common brand, and this problem might actually give knoppix a bad reputation.
Other than that, knoppix rocks!!![]()
You can also try passing "apm=off" or apm=real-mode-poweroff to the kernel during startup. apm=real-mode-poweroff is better because it keeps other apm-features (advanced power managment).
Wow, I keep reading about this problem. I've been using KNOPPIX with Dell exclusively for over a year now on serveral PCs (new and old, dimension and optiplex) without a hitch! Lucky I guess....
Regards,

AMD Ryzen 5 5500 Processor ( read Description)
$59.00
AMD Ryzen 7 5800X Desktop Processor (4.7GHz, 8 Cores, Socket AM4)
$150.00
Intel Core i7-4770 3.40GHz Quad Core SR149 LGA 1150 CPU Processor tested
$35.00
INTEL CORE I9-10940X X-SERIES PROCESSOR | 3.30GHZ | SRGSH
$179.99
Intel Core i7-3770K 3.5 GHz Processor
$39.00
Intel Core i7-9700 Octa-Core 3 GHz Desktop Processor LGA 1151
$79.99
Intel Core i5-12500T SRL5W 2GHz 18MB 6 Core Socket LGA1700 Desktop CPU Processor
$114.99
Intel i7-8700 Coffee Lake 3.2GHz 6-Core Max Turbo 4.6GHz Processor
$67.99
Intel Core i7-10700 8-Core 16-Thread 2.9GHz Desktop CPU LGA1200 SRH6Y Z490 Z590
$129.00
(LOT OF 20) Intel Core i5-8400 CPU 2.80GHz Desktop Processor (SR3QT)
$700.00