The firmware does not supply the _PSS (Performance Supported States) object that informs the kernel the supported processor performance states of the system. This explains why cpu scaling does not work for any kernel you chose.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1307794 Title: CPU frequency scaling not available To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1307794/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs