ACPI AE_NOT_FOUND errors usually come from buggy firmware which uses the objects but not actually implemented.
Can spot which parts of firmware errors if you can support acpidump log. $sudo acpidump > acpidump.log ** Changed in: linux (Ubuntu) Status: In Progress => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2060981 Title: ACPI BIOS errors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2060981/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs