Re: Suspend on Dell XPS 9550

[coypu%sdf.org@localhost]

Took another stab at it, so now I can make the following statements:

- linux can still suspend with tpm blacklisted
- wakeup_16 is not reached[1]

[1] I attempted to beep the PC speaker, which works fine from locore.
Alternatively setting the waking vector to some garbage paddr didn't
seem to cause any change.

Failed things:
- Disabling SMP
- Various configurations of disabling hardware, both in BIOS and via
  userconf
- UEFI


I found the ACPI 6.2a docs[2] which talk about PM1a_CNT / PM1b_CNT and
other things which might not be touched by our current sleep, I'll try
to use acpica functions which do this (like AcpiHwLegacySleep).

[2] http://www.uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf page 780-781