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My system: Acer Aspire V3-771G, i7, 16Gb RAM, 128Gb SSD, 750Gb HD, 17,3" FullHd etc.
Because Windows 8 on UEFI BIOS does not fully shut down (to start faster) the hotkeys do not function.
To fully shut Windows 8 down you can create a new shortcut: shutdown.exe /s /f /t 00
or you can also disable "Turn on fast startup (recommended)" in the energy options.
Then the hotkeys should work again at the next power on.