I got a tip from Navin at https://bugzilla.kernel.org/show_bug.cgi?id=118401 to try acpi=noirq and this does not only let me boot kernels>=4.3 (I'm writing this from mainline 4.7!), but also makes it poweroff and restart correctly.
However, it does not resume from suspend (it seems to suspend as it should, but clicking the power button to turn it back on does nothing). ** Bug watch added: Linux Kernel Bug Tracker #118401 http://bugzilla.kernel.org/show_bug.cgi?id=118401 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1463422 Title: [Lenovo IdeaCentre A740] Doesn't poweroff on shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1463422/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
