I recently got an Asus Q551L laptop with touchscreen and running on Windows 8.1 and cannot use the touchscreen to draw in Photoshop CS6. I can use it to choose a tool but when I drag my finger across a layer, it does not draw unless I start in the gray area surrounding the image. I have tested a few programs including Microsoft Paint and Illustrator CS6 and I can start drawing in the middle of the image like what I wanted; it's only Photoshop with this problem of not being able to draw unless I start at the edge. So how can I fix this?
Photoshop relies on the pressure sensitivity that is so popular with the Wacom tablets. This means that it ignores the capacitive pen when drawing. But seams to work fine for other features like accessing the UI buttons. I am not sure how this helps you since I do not know what pens will work on your screen. But maybe this will at least point you in the right direction.