I've been trying to use the optimus nouveau switcheroo patch, but when I
switch to discrete, the screen just freezes. Switching back to
integrated does work.

This makes an 'ubuntu sound', so I guess X does work: echo DIS > switch
; start gdm; sleep 5; stop gdm; sleep 2; echo IGD > switch

** Attachment added: "LENOVO-4173W2X.tar.gz"
   
https://bugs.launchpad.net/lpbugreporter/+bug/752542/+attachment/2683010/+files/LENOVO-4173W2X.tar.gz

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https://bugs.launchpad.net/bugs/752542

Title:
  ACPI DSDT info

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