I was about to post to linux-acpi when I tried:

sudo su
echo 1 > /sys/bus/pci/rescan

which successfully brings back the wifi, wired ethernet, and card
reader!  Should I still post to the mailing list, or does this open up
alternatives for us?

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https://bugs.launchpad.net/bugs/1555775

Title:
  WiFi + wired ethernet broken after suspend on Alienware 15 R2

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