Ethernet interface disappears after resume from Suspend to Idle

Solution In Progress - Updated -

Environment

  • Red Hat Enterprise Linux 8.2
  • 10th Generation Intel® Core™ CPU with vPro™
  • i219LM Ethernet using the e1000e driver

Issue

  • After a Suspend to Idle (also known as 'freeze', Modern Standby, or S0ix) sleep/resume cycle the wired Ethernet interface disappears, and the system will not sleep again. Only a full reboot restores the Ethernet, and ability to put the system to sleep.
  • e1000e failed to resume from Suspend to idle, the driver will be abnormal after resume.
  • Second suspend doesn't work on Comet Lake based systems

Resolution

Red Hat Enterprise Linux 8.2 Batch Update 1 kernel-4.18.0-193.6.3.el8_2 includes a fix for this issue. Red Hat Enterprise Linux 8.3 will also include this fix.

You can also use the following workaround to avoid the issue:
- Switch the system's default 'sleep' mode from the new "Suspend to Idle" method to the older "S3" method by passing the following parameter on the kernel command line: mem_sleep_default=deep

Root Cause

  • Updated firmware for the Intel Management Engine built into systems with vPro technology caused a timing issue that prevented the Ethernet interface from resuming from a Suspend to Idle sleep event.

Diagnostic Steps

[ 1341.522283] e1000e 0000:00:1f.6 eno1: PHY Wakeup cause - Unicast Packet
[ 1342.188846] e1000e 0000:00:1f.6 eno1: Hardware Error
[...]
[ 1593.390533] e1000e: EEE TX LPI TIMER: 00000011
[ 1595.327180] PM: pci_pm_suspend(): e1000e_pm_suspend+0x0/0x5e0 [e1000e] returns -2
[ 1595.327182] PM: dpm_run_callback(): pci_pm_suspend+0x0/0x150 returns -2
[ 1595.327183] PM: Device 0000:00:1f.6 failed to suspend async: error -2
[ 1595.990957] PM: Some devices failed to suspend, or early wake event detected

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