Support in other languages: 
Showing results for 
Search instead for 
Do you mean 

Welcome to the Forums!

Welcome to Lenovo's Peer-to-Peer Discussion Community!
Please note our guidelines. How to register and login and Community FAQs.

Help Lenovo Shape the Future of PCs

Take the ownership survey. Share your ideas with our product team

Community Spotlight

Visit the Community Blog

ACPI support on Linux - ThinkPad L420

0 Kudos
Click ►
Started ‎07-10-2012 by
Modified ‎07-10-2012 by




I recently bought a ThinkPad L420 and decided to run Ubuntu on it. Unfortunately, it only works (i.e. boots) when booting with disabled ACPI. Otherwise, the boot process would just not finish. Of course this means HyperThreading is disabled and other stuff is not working (no suspend, hibernation, need to press the power button after shutdown etc). How do I get it resolved?


Updating to  the newest BIOS (available as of now) should resolve the issue.If you are using a 64 bit version of Linux,it should recognize all of your RAM and all the CPU Cores as well.