uefi - Shutdown, restart and suspend problems on Acer E5 511 (Sandy Bridge) 14.04 and 15.04

Lot's of similar problems out there. Basically I have tried most or all of the suggestions offed but to no avail.

Specifically. I installed Unity 15.04 on two Acer E5 511 C1WE laptops and it seems to work great in UEFI with secure boot turned off, a bit shaky in legacy, seems more flickery and unstable in boot up, but it still works fine, both modes on both laptops suffer from the same problem as follows:

Shutdown, restart and suspend all require me to hard restart, screen goes dark and I get this message:

[ OK ] Started Light Display Manager.
[ OK ] Started ACPI event daemon.
       Starting ACPI event daemon...
       Starting Network Manager Script Dispatcher Service....
[ OK ] Started Network Manager Script Dispatcher Service.

system then tries to reboot and hangs. I hard Shutdown with the button.When I restart typically it will hang again, sometimes even twice before I get a clean boot. I get GRUB options and sometimes not?

I have two identical laptops here and I am getting consistent results from both so I can count out it just being this unit.

Anyway I would be happy to provide more info. I am quietly hopping that this will get sorted soon in an update, as it seems to be a broad sweeping issue. But as a recent convert to Ubuntu I can't assume that?

Thanks!