Happened again today.

[228215.830259] PM: Entering mem sleep
[228215.830326] Suspending console(s) (use no_console_suspend to debug)
[228215.953981] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[228215.954146] sd 0:0:0:0: [sda] Stopping disk
[228216.173167] nouveau  [     DRM] suspending display...
[228216.173285] nouveau  [     DRM] unpinning framebuffer(s)...
[228216.173928] nouveau  [     DRM] evicting buffers...
[228216.174918] nouveau  [     DRM] waiting for kernel channels to go idle...
[228216.174939] nouveau  [     DRM] suspending client object trees...
[228216.176857] pci_pm_suspend(): e1000_suspend+0x0/0x20 [e1000e] returns -2
[228216.176861] dpm_run_callback(): pci_pm_suspend+0x0/0x150 returns -2
[228216.176862] PM: Device 0000:00:19.0 failed to suspend async: error -2
[228216.183169] nouveau  [     DRM] suspending kernel object tree...
[228217.504658] PM: Some devices failed to suspend, or early wake event detected

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https://bugs.launchpad.net/bugs/1250476

Title:
  8086:1502 [Lenovo ThinkPad W530] e1000e module sometimes prevents
  suspend to ram

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