Okay, while RoMark seems to have forgotten one aspect of his query (as his prerogative), you've answered that the thing will work when, for anything I've found, it doesn't have PS/2. Which, to me, means you didn't read the question properly and raises the follow-on question of whether, frankly, you can be believed ..which, for me at least, has a knock-on effect for anything else, you know?
Now I know that looks like an attack but you can't begin to know how much I loathe being told by people on your side of the phone that something will work, or "I'm sure it will", only to be burned by taking their answers at face value. Point being: details, Wesley: all the details, all the time. And "I don't know" is a perfectly valid, even GOOD, answer, it's certainly better than blowing smoke up someone's arse by not paying attention and guessing. Oh, as an example of something that does answer the physical aspects of the question, the
Aten CS52 apparently does PS/2 and USB. As to Linux compatibility:
I don't know, but I can't imagine why it would be a problem, in my experience KVM-switching hot-key combinations are usually below the level of the OS ...usually. But I'm not selling this thing here and have no need or further interest in absolutely determining that. So, cautionary tale, mkay?