[Bug 1354306]

[dann frazier]

Note that, due to a firmware change, the m400 rule should use
"gpio_keys" instead of "gpio-keys". Here is the new rule:

SUBSYSTEM=="input", KERNEL=="event*", SUBSYSTEMS=="platform",
KERNELS=="gpio_keys.6", PROGRAM="/bin/grep '^HP ProLiant m400 Server
Cartridge$' /proc/device-tree/model", TAG+="power-switch"

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https://bugs.launchpad.net/bugs/1354306

Title:
  gpio shutdown trigger for ProLiant m400 cartridges

Status in systemd:
  Confirmed
Status in “systemd” package in Ubuntu:
  Triaged
Status in “systemd” source package in Trusty:
  Triaged
Status in “systemd” source package in Utopic:
  Triaged

Bug description:
  Similar to the m800 case in LP: #1347776, udev/systemd also needs to
  know how to trigger a graceful shutdown on ProLiant m400 cartridges.

  [Impact]
  Without this change, the power down button will not initiate an OS shutdown on this platform.
  [Test Case]
  Push button. Watch poweroff occur.
  [Regression Potential]
  The new rule is pretty tightly bound to the m400 system - so the risk of this rule matching and impacting behavior on a different platform is minimal. This will presumably cause new code to run and read /proc/device-tree/model on other platforms - but this is already done for the m800 system in both utopic and trusty.

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