D
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No, you know how most monitors have a USB hub built in, so you can just connect all your stuff to the monitor and have one cable go to the PC?
The U3415W has that, but it has two upstream ports for connections back to a PC, instead of one like most. You only need one per system. There's a setting in the monitor OSD to specify which inputs have USB assigned. So the setup would look like this:
dp cable to mDP input & USB cable 1 - ubuntu system
dp cable to DP input & USB cable 2 - Mac system
keyboard and mouse combo USB wireless thing (it looks like it has one of those USB wireless dongle things) connected to USB port on monitor
setting in monitor menu "USB selection":
USB 1 - mDP
USB 2 - DP
What this means is that USB upstream port 1 will be active when you are on the mDP input, and upstream port 2 will be active when you are on the regular DP input.
So when you change inputs to switch between your Mac and your Ubuntu system, you don't need to move the wireless dongle for your keyboard/mouse combo (or any other USB devices you have connected to the monitor, like a headset, webcam, whatever) - the monitor will change the active USB upstream port to match automatically, and your keyboard/mouse/etc will all be connected to whichever system you have up on the display.
(there's pictures of the OSD here so you can see the menu I mean: http://www.tomshardware.com/reviews/dell-u3415w-34-inch-ultra-wide-curved-monitor,4186-3.html)
The U3415W has that, but it has two upstream ports for connections back to a PC, instead of one like most. You only need one per system. There's a setting in the monitor OSD to specify which inputs have USB assigned. So the setup would look like this:
dp cable to mDP input & USB cable 1 - ubuntu system
dp cable to DP input & USB cable 2 - Mac system
keyboard and mouse combo USB wireless thing (it looks like it has one of those USB wireless dongle things) connected to USB port on monitor
setting in monitor menu "USB selection":
USB 1 - mDP
USB 2 - DP
What this means is that USB upstream port 1 will be active when you are on the mDP input, and upstream port 2 will be active when you are on the regular DP input.
So when you change inputs to switch between your Mac and your Ubuntu system, you don't need to move the wireless dongle for your keyboard/mouse combo (or any other USB devices you have connected to the monitor, like a headset, webcam, whatever) - the monitor will change the active USB upstream port to match automatically, and your keyboard/mouse/etc will all be connected to whichever system you have up on the display.
(there's pictures of the OSD here so you can see the menu I mean: http://www.tomshardware.com/reviews/dell-u3415w-34-inch-ultra-wide-curved-monitor,4186-3.html)