[ltp] T430 Ultrabay hotswap EJECT_REQUEST event

[Kevin Locke]

Hi All,

I am trying to configure a ThinkPad T430 for hotswapping Ultrabay
devices based on the instructions on ThinkWiki.[1]  Everything is
working smoothly except that the udev rule for running the Ultrabay
eject script is not being fired when I unlock the bay lock latch.[2]
I'm wondering if this is expected behavior (because the latch is
purely physical) or if it's a software/firmware issue.  Has anyone had
any luck getting this to work on recent ThinkPads?

Troubleshooting Information:
- The T430 has a Serial Ultrabay Enhanced bay.
- I'm running an unpatched Linus 4.3 kernel under Debian testing.
- Nothing is printed by acpi_listen when unlocking the bay lock latch.
- Nothing is printed by evtest on the "ThinkPad Extra Buttons" input
  device (with hotkey_mask set to hotkey_all_mask) when unlocking the
  bay lock latch.
- The DSDT contains references to the following Eject Request events:
    Notify (\_SB.PCI0.LPC.EC.BAT1, 0x03) // Eject Request
    Notify (\_SB.PCI0.SAT1.PRT1, 0x03) // Eject Request
    Notify (\_SB.PCI0.SAT1.SCND.MSTR, 0x03) // Eject Request

Recommendations?
Is there an event that I can listen for, or should I just run the
ultrabay_eject script manually?  Is there a way to trigger Ultrabay
eject from desktop environments?  (It looks like udisks support for
Ultrabay device removal has been stalled for years[3] so perhaps not?)

Any thoughts/recommendations are appreciated!

Thanks,
Kevin

1.  http://www.thinkwiki.org/wiki/How_to_hotswap_Ultrabay_devices
2.  https://support.lenovo.com/us/en/docs/um014930
    (in the section Replacing the Ultrabay device)
3.  https://bugs.freedesktop.org/show_bug.cgi?id=23110

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