Using acpi_osi=Windows 2012 on grub's command line seems to help. I suspended and resumed a couple of times and the AC is detected correctly and so is the lid state (which now suspends the box).
Using acpi_osi=Windows 2012 on grub's command line seems to help. I suspended and resumed a couple of times and the AC is detected correctly and so is the lid state (which now suspends the box).