Comment 0 for bug 868208
Revision history for this message
| Amir Mlk (a-malekpour-gmail) wrote Changing screen back-light freezes the laptop | #0 |
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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.