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:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=\"!Windows 2012\""
Then run "sudo update-grub".
** Changed in: linux-lts-raring (Ubuntu)
Status: New => Incomplete
** Changed in: linux-lts-raring (Ubuntu)
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1231305
Title:
Unable to adjust screen brightness with Intel Haswell-ULT Integrated
Graphics Controller [8086:0a26]
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