Public bug reported:
I have installed Ubuntu 11.04 on a new Lenovo T420 laptop (Core i7,
NVIDIA NVS 4200M Graphics with Optimus) and I'm observing strange
behaviors most notably, changing backlight causes the laptop to freeze.
Also, running on battery is not possible since if I unplug the power,
Ubuntu freezes. I'm guessing this is an ACPI issue but haven't still
figured out what is wrong. thinkpad_acpi is loaded automatically. Boot-
time crashes are also very commonplace.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/868208
Title:
Changing screen back-light freezes the laptop
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