@Rocko indeed. I have enabled the Bumblebee experimental power management and now battery life is 3h15 instead of 2h00, and the fan is at comfort now while it has been soothing like hell.
reference: https://github.com/Bumblebee-Project/Bumblebee/wiki/ACPI- Removed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/818830 Title: [Sandy Bridge] serious power regression from kernel 3.0.0-6 to 3.0.0-7 (rc6 disabled) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/818830/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs