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

[Alex Hung]

[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.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-oem-5.14/5.14.0-1021.23 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.14 - 5.14.0-1022.24

---------------
linux-oem-5.14 (5.14.0-1022.24) focal; urgency=medium

  * focal/linux-oem-5.14: 5.14.0-1022.24 -proposed tracker (LP: #1959585)

  * Got black screen when resume from s2idle with AMD dGPU (LP: #1955790)
    - drm/amdgpu: don't do resets on APUs which don't support it

  * CVE-2022-0330
    - drm/i915: Flush TLBs before releasing backing store

  * CVE-2022-22942
    - SAUCE: drm/vmwgfx: Fix stale file descriptors on failed usercopy

  * CVE-2022-23222
    - bpf: Don't promote bogus looking registers after null check.
    - bpf, selftests: Add verifier test for mem_or_null register with offset.

  * CVE-2022-24122
    - ucount: Make get_ucount a safe get_user replacement

  * The display output on type-c hub doesn't work on ADL platform (LP: #1959061)
    - SAUCE: drm/i915/adlp: Fix TypeC PHY-ready status readout

 -- Timo Aaltonen <email address hidden> Mon, 31 Jan 2022 17:45:20 +0200