[SRU][OEM-5.13/OEM-5.14/U] Fix mt7921e wifi timeout error after resume

[AaronMa]

SRU justification:

[Impact]
Mediatek 7921 wifi card is lost when stress S3.

[Fix]
Check the valid events from firmware, make it resume back.
The patch is in maintainer's tree, but not merged to Linus's tree.
Due to the schedule, send SRU as SAUCE patch.

[Test]
Verified on hardware, wifi works fine after stress S3.
Tested on 3 platforms include the one platform that can reproduce the issue, all good.

[Where problems could occur]
Mediatek 7921 wifi may be broken.

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

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1942994

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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

This bug is awaiting verification that the 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!

[AaronMa (mapengyu)]

Verified on 5.13-oem kernel.

[AaronMa (mapengyu)]

Still not in oem-5.14-next branch.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.13 - 5.13.0-1014.18

---------------
linux-oem-5.13 (5.13.0-1014.18) focal; urgency=medium

  * focal/linux-oem-5.13: 5.13.0-1014.18 -proposed tracker (LP: #1944429)

  * CVE-2021-40490
    - ext4: fix race writing to an inline_data file while its xattrs are changing

  * CVE-2021-41073
    - io_uring: ensure symmetry in handling iter types in loop_rw_iter()

 -- Timo Aaltonen <email address hidden> Wed, 22 Sep 2021 18:34:24 +0300

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oem-5.14 - 5.14.0-1007.7

---------------
linux-oem-5.14 (5.14.0-1007.7) focal; urgency=medium

  * focal/linux-oem-5.14: 5.14.0-1007.7 -proposed tracker (LP: #1949349)

  * Intel I225-IT ethernet controller: igc: probe of 0000:02:00.0 failed with
    error -1 (LP: #1945576)
    - igc: Remove _I_PHY_ID checking
    - igc: Remove phy->type checking

  * Fix Screen freeze after resume from suspend with iGPU [1002:6987]
    (LP: #1949050)
    - drm/amdgpu: reenable BACO support for 699F:C7 polaris12 SKU
    - drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE on suspend
    - drm/amdgpu: Fix crash on device remove/driver unload

  * Fail to detect audio output from external monitor (LP: #1948767)
    - ALSA: hda: intel: Allow repeatedly probing on codec configuration errors

  * Fix System hangs on black screen when reboot (LP: #1949321)
    - SAUCE: drm/i915: Don't request GMBUS to generate irqs when called while irqs
      are off
    - SAUCE: drm/i915/hdmi: Turn DP++ TMDS output buffers back on in
      encoder->shutdown()

 -- Timo Aaltonen <email address hidden> Mon, 01 Nov 2021 12:38:15 +0200

[Timo Aaltonen (tjaalton)]

fixed in 5.15.3