I recently installed Ubuntu on my XPS 15 9560. The power drainage seems to be very high. When using powerstat I saw numbers between 17 and 25 watts. This was with a few applications open and with the brightness set to 40% I thought that it was the NVIDIA gpu so I ran prime-select and saw that it was (or at least thought) that it was using Intel . I have tlp and tlp-rdw both installed and have updated the kernel to 4.10 . I'm using the proprietary Nvidia drivier ( 375.66 ). I am not using the proprietary Intel driver. I also have the touch screen disabled. The first part of powertop can be found below:

Usage Device name 27.7% CPU misc 229.0 ops/s GPU misc 27.7% DRAM 27.7% CPU core 229.0 ops/s GPU core 14.1 pkts/s Network interface: wlp2s0 (ath10k_pci) 100.0% Audio codec hwC0D0: Realtek 30.1% Display backlight 0.0% Audio codec hwC0D2: Intel 100.0% Radio device: ath10k_pci 100.0% USB device: usb-device-0cf3-e301 100.0% USB device: AX88x72A (ASIX Elec. Corp.) 100.0% USB device: xHCI Host Controller 100.0% USB device: Flash Drive FIT (Samsung) 100.0% USB device: xHCI Host Controller 100.0% USB device: usb-device-138a-0091 0.5 pkts/s Network interface: enx0050b61a1074 (asix)

I have the XPS with the high DPI display, 32 GBs of memory and a i7.