Same. You can use the Windows 8 interface only with a mouse or a touchpad, you got no chance with using it via keyboard.
Lol you serious? Ive found they keyboard to always be needed to do things quickly on Windows or Linux, and Windows 8/8.1 are no exception. The keyboard makes accessing the newer features (ie charms bar) a fair bit faster using Start-C than using your mouse.
The (OS specific) shortcuts I use a whole heap is when searching, Start-Q to search (Or Start then type) and Start-W for settings search, and Start-F for file search. Alot nicer than just having once search, but a huge pain to use with a mouse (Requires you to stop typing, use the mouse to switch categories, and perhaps continue typing) and ok with touch.
To say you can't use it with a keyboard is IMO ridiculous, and brings me to question your experience using a Windows OS (most shortcuts have been with windows for a while, I can recall about 6 or 7 new ones for Win 8/8.1, and NONE that have been removed)
What does gputest actually do and another question.
So, what does gputest do, and how does it do it? With the radeon drivers it's normal to see it getting trounced by the catalyst drivers yet when it comes to actual games the results are far closer. Similarly, windows seems to be consistently ahead by a great margin with the various gputests but the gaming results are, again, much closer.
What's going on with the gtx680? Linux is consistently performing a good deal better on that card than w8.1.