Public bug reported:

A recent update (LP: #1778011) in 18.04 has restored the PRIME switching
mechanism in Gdm 3 only, while still leaving out support for other login
managers (such as Lightdm, and SDDM).

In addition to this, we should restore the default pci power control
profile for the dGPU when re-enabling performance mode, as we do in
Ubuntu 18.10.

** Affects: nvidia-prime (Ubuntu)
     Importance: High
         Status: Fix Released

** Affects: ubuntu-drivers-common (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: nvidia-prime (Ubuntu Bionic)
     Importance: High
     Assignee: Alberto Milone (albertomilone)
         Status: In Progress

** Affects: ubuntu-drivers-common (Ubuntu Bionic)
     Importance: High
     Assignee: Alberto Milone (albertomilone)
         Status: In Progress

** Also affects: ubuntu-drivers-common (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-drivers-common (Ubuntu)
       Status: New => In Progress

** Also affects: ubuntu-drivers-common (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: nvidia-prime (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: nvidia-prime (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: nvidia-prime (Ubuntu)
     Assignee: Alberto Milone (albertomilone) => (unassigned)

** Changed in: nvidia-prime (Ubuntu Bionic)
     Assignee: (unassigned) => Alberto Milone (albertomilone)

** Changed in: nvidia-prime (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: nvidia-prime (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: ubuntu-drivers-common (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: ubuntu-drivers-common (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: ubuntu-drivers-common (Ubuntu Bionic)
   Importance: Undecided => High

** Changed in: ubuntu-drivers-common (Ubuntu Bionic)
     Assignee: (unassigned) => Alberto Milone (albertomilone)

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https://bugs.launchpad.net/bugs/1797147

Title:
  Backport PRIME switching fixes to Ubuntu 18.04

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