Dell Sputnik XPS 13 touchpad settings not working in updated ubuntu/mint.
OK, After troubleshooting this for several days, i finally found the solution here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1296743 Symptoms are: Touchpad works, but no settings work... scroll, disable tap to click, disable touchpad while typing... none of these settings work or save. Drives me CRAZY. Anyway:
1. Open /etc/modprobe.d/blacklist. conf in your favorite text editor. 2. Add the line 'blacklist i2c-hid' (no quotes) 3. Save and reboot