Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I installed Debian 5.03 Lenny successfully on my machine. I got this error during boot:

ACPI : invalid PBLK length [5].

After that the Operating System boots properly and starts normally.

What does this error statement mean? Is it safe to work with this installation despite this error?

share|improve this question

migrated from Sep 21 '10 at 11:29

This question came from our site for professional and enthusiast programmers.

I used to get this with earlier versions of Ubuntu (which is based on Debian). It turned out to be just that not all BIOS manufacturers had properly implemented the ACPI power management. PBLK was some structure in the BIOS and Ubuntu expected it to be correctly formatted.

The only downside for me was that the machine didn't power off completely on its own. It had to be manually cycled when the final shutdown message appeared from the kernel.

I found that, short of recoding a chunk of the Linux distro, there was no way around it.

I've long since tossed out both that motherboard and the early Ubuntu (so I don't actually know if a later Debian would fix it) and no longer have the problem. You might want to consider those possibilities if it worries you.

share|improve this answer
The problem is still present as of today, even with newer kernels. – spydon Sep 2 '14 at 13:13
Got it as well with Debian 8. During install and after when starting my machine. Seems to work normal. – Guus May 21 '15 at 10:53

You must log in to answer this question.