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https://bugs.launchpad.net/bugs/1956373

Title:
   Fix for rare (~1%) s0ix failures o AMD systems

Status in HWE Next:
  New
Status in linux-oem-5.14 package in Ubuntu:
  Invalid
Status in linux-oem-5.14 source package in Focal:
  Fix Committed

Bug description:
  [Impact]

    A rare (~1%) failure has been reported in the community for a period
  of time on Renoir platforms with s0ix. This failure was also
  corroborated once by a Cezanne user.

  [Fix]

    In the s0ix entry need retain gfx in the gfxoff state, so skipping
  setting gfx cgpg in the S0ix suspend-resume process.

    The fix was cherry-picked from 5.16-rc8.

  [Test]

    This is requested by AMD.
    
  [Where problems could occur]

    Low risk. This only affects AMD systems that support s0ix.

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