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** Tags added: verification-needed-focal

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https://bugs.launchpad.net/bugs/1865570

Title:
  suspend only works once on ThinkPad X1 Carbon gen 7

Status in linux package in Ubuntu:
  Triaged
Status in linux-oem-osp1 package in Ubuntu:
  New
Status in linux source package in Bionic:
  Won't Fix
Status in linux-oem-osp1 source package in Bionic:
  New
Status in linux source package in Eoan:
  New
Status in linux-oem-osp1 source package in Eoan:
  Won't Fix
Status in linux source package in Focal:
  Triaged
Status in linux-oem-osp1 source package in Focal:
  Won't Fix

Bug description:
  === SRU Justification ===

  [Impact]
  Lenovo X1 Carbon 7th can only susped (s2idle) once, subsquent suspends
  are blocked by failed e1000e resume routine.

  [Fix]
  It's not root caused yet by Intel, so disable the s0ix flow on X1 Carbon
  7th as a temporary workaround.

  [Test]
  After applying the DMI quirk patch, e1000e keeps working, so it doesn't
  block s2idle anymore.
  User also confimred the workaround works.

  [Regression Potential]
  Low. It limits to a specific model, and I can confirm s0ix can still be
  reached withouth this feature.

  === Original Bug Report ===

  5.4.0-16 and 5.4.0-17 go to suspend when the lid is closed, but *only
  once* after boot. On subsequent attempts, when the lid it closed,
  backlight and wifi are turned off, but system does not suspend.

  First successful suspend:
  [ 147.413295] PM: suspend entry (s2idle)
  [ 147.416601] Filesystems sync: 0.003 seconds
  [ 147.419371] Freezing user space processes ... (elapsed 0.001 seconds) done.
  [ 147.421210] OOM killer disabled.
  [ 147.421210] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) 
done.
  [ 147.422375] printk: Suspending console(s) (use no_console_suspend to debug)
  [ 147.422630] wlp0s20f3: deauthenticating from 18:d6:c7:61:95:c2 by local 
choice (Reason: 3=DEAUTH_LEAVING)
  [ 147.527810] e1000e: EEE TX LPI TIMER: 00000011
  [ 150.246317] ACPI: EC: interrupt blocked
  [ 881.134544] ACPI: EC: interrupt unblocked
  [ 883.933255] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
  [ 884.047802] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
  [ 884.112730] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
  [ 886.815475] e1000e 0000:00:1f.6 enp0s31f6: PHY Wakeup cause - Unicast Packet
  [ 887.485832] e1000e 0000:00:1f.6 enp0s31f6: Hardware Error
  [ 888.016931] OOM killer enabled.
  [ 888.016932] Restarting tasks ... done.
  [ 888.060613] PM: suspend exit

  Second unsuccessful suspend:
  [ 907.584802] PM: suspend entry (s2idle)
  [ 907.589779] Filesystems sync: 0.004 seconds
  [ 907.591416] Freezing user space processes ... (elapsed 0.002 seconds) done.
  [ 907.593518] OOM killer disabled.
  [ 907.593518] Freezing remaining freezable tasks ... (elapsed 0.328 seconds) 
done.
  [ 907.921560] printk: Suspending console(s) (use no_console_suspend to debug)
  [ 907.922127] wlp0s20f3: deauthenticating from 18:d6:c7:61:95:c2 by local 
choice (Reason: 3=DEAUTH_LEAVING)
  [ 908.024438] e1000e: EEE TX LPI TIMER: 00000011
  [ 909.916364] PM: pci_pm_suspend(): e1000e_pm_suspend+0x0/0x80 [e1000e] 
returns -2
  [ 909.916367] PM: dpm_run_callback(): pci_pm_suspend+0x0/0x150 returns -2
  [ 909.916369] PM: Device 0000:00:1f.6 failed to suspend async: error -2
  [ 911.183052] PM: Some devices failed to suspend, or early wake event detected
  [ 911.197091] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
  [ 911.314903] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
  [ 911.382438] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
  [ 911.413624] OOM killer enabled.
  [ 911.413625] Restarting tasks ... done.
  [ 911.462021] PM: suspend exit

  It looks like Ethernet driver prevents suspend. Ethernet is not
  connected (I do not have the adaptor).

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