What hardware components work, and what doesn't work?
Works On: 13.10, 14.04
The laptop works with very few issues. The hi-DPI screen is somewhat hard to see, but can be tweaked to be acceptable for most people.
Touch Screen: fail
Touch screen will click and select, but can't scroll web pages. With multiple monitors, the clicks are detected as being on whatever the "main" monitor is, which might not be the laptop screen.
(the quadhd-touchscreen driver provided here or directly on dell server might help to fix the touch-screen detection problem. Before this, I add touch-screen active 1 time over 10 or 15 reboot, now it seems to work each time I start ubuntu)
Media Keys: ok
Integrated Graphics: ok
Dedicated Graphics: fail
NVidia 750m does not show up... though I've heard that you can get it working with some effort using bumblebee.
SD Card Reader: ok*
*SD card reader requires kernel 3.13. In 3.12 and before, it is not detected.
Mini DisplayPort: ok
Optical Drive: N/A
1/8" Headset port: works*, though with very annoying background hiss
*Requires kernel 3.13, before that it didn't mute the main speakers when the headset was plugged in.