I found out that:
a) it only affects x64 systems
b) it is not related to ubuntu only, but also to fedora (and so I think on all
x64 systems)
c) it is related to the linux kernel, because I have a x64 windows and it works
"fine" (as far you can call windows fine ;) )
d) to run a x64 system though, you cann add the following kernel parameters
noapic pci=assign-busses apicmaintimer idle=poll reboot=cold,hard
(http://ubuntuforums.org/showthread.php?t=1084622)
e) The debug boot options says additionally
ACPI: Added _OSI(Processor Aggregator Device)
ACPI: EC: Loop up EC in DSDT
You can also visit this thread:
http://forums.lenovo.com/t5/Linux-Discussion/Buggy-DSDT-for-ThinkPad-L420-and-probably-others/td-p/591955
that
I hope you will find a solution soon.
Regards
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https://bugs.launchpad.net/bugs/990110
Title:
[Lenovo L420] System will not boot Precise installer kernel
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