** Description changed:

  [Impact]
  S2idle doesn't work on AMD Renoir and Cezanne.
  
  [Fix]
  Backport AMD PMC driver and pull many new patches let AMDGPU support s2idle.
  
  [Test]
  Suspend the laptop and the system freezes.
  With the patch applied, suspend works but with some caveats:
  1) Keyboard sometimes can't wake up the laptop.
  2) Touchpad sometimes can wake up the laptop.
- 3) RTC can't wake up the laptop.
+ 3) RTC can't wake up the laptop. (Hardware Limitation)
  
  [Where problems could occur]
  Most changes are limited to logic of suspend/resume, and specific to Renoir 
GFX.
  However, there are some refactoring patches may cause unintended results, so 
AMDGPU may break for sleep/hibernation/runtime suspend on non-Renoir GFXs.

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https://bugs.launchpad.net/bugs/1927067

Title:
  Add s2idle support on AMD Renoir and Cezanne

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