Looks like the BIOS is flawed when it's running the win8 path.
Can you add the acpi_osi=\"!Windows 2012\" to the grub command line when booting the 3.8 kernel and see if the problem still exists? You can do that by adding acpi_osi=\"!Windows 2012\" to the variable "GRUB_CMDLINE_LINUX_DEFAULT" in /etc/default/grub:
Looks like the BIOS is flawed when it's running the win8 path.
Can you add the acpi_osi=\"!Windows 2012\" to the grub command line when booting the 3.8 kernel and see if the problem still exists? You can do that by adding acpi_osi=\"!Windows 2012\" to the variable "GRUB_CMDLINE_ LINUX_DEFAULT" in /etc/default/grub:
e.g: LINUX_DEFAULT= "quiet splash acpi_osi=\"!Windows 2012\""
GRUB_CMDLINE_
Then run "sudo update-grub".