I have a Logitech wireless keyboard and mouse combo connected to this machine. I used to have an issue in Windows where the keyboard appeared to sleep, or stopped responding to keystrokes and had trouble waking, but that has largely resolved itself. I would be typing away looking at my keyboard, only to look up and see most of what I typed missing. I haven't noticed that happening in Windows lately, but in Kubuntu I see it happening fairly often. Same thing, typing away, look up and no keystrokes recorded. Obviously using a wired connection solves that problem but then I have a messy lead + an extension lead to deal with. While I haven't yet tested with a new set of batteries for the keyboard, it would be weird that low batteries would only affect Linux, not Windows. For the record, when I was having issues in Windows I did try new batteries = same result. The keyboard is only about 4 feet, 1200 mm away from the wireless receiver and there is nothing between the keyboard and its receiver. The mouse does not ever have any issue connected to the same receiver. I even tried a brand new keyboard / mouse combo, although the exact same make and model, with the same results. Any ideas?