Re: Boot fails on Thinkpad L420 without ACPI=off or nosmp

Hi Steve,

Thanks for the report.

OS Information
OS:  Linux 3.1.0-rc9-1-desktop x86_64
System:  openSUSE 12.1 RC 1 (x86_64)
KDE:  4.7.2 (4.7.2)

Hardware Information
Lenovo Thinkpad L420 Model number 78544KM
i5-2520M(2.50GHz)
Intel HD Graphics

Problem
Fails to boot without boot option of either acpi=off, nosmp, or maxcpus=0

How about simply "noapic"

or if that fails, then:

maxcpus=1, noapic

That should get you up in ACPI mode, but w/ the IOAPIC disabled.

Almost immediately freezes. CapsLock does not work and only way to continue is 
to power off with the power button.

With debug on last line of output reads:
ACPI: CE: Look up EC in DSDT

Fails with kernel 3.04 and 3.1 and all distro's I have tried with.

have you tried any distros that are running a kernel older than 3.04?

thanks,
-Len