OK, as expected linux-firmware upgrade seems to be unrelated. After
doing more than two dozen shutdowns with each kernel (4.15.0-10 and
4.15.0-12) I see the following pattern:

* secure boot enabled or disabled makes no difference

* kernel 4.15.0-10 correctly powers off system (halt -p) every time,
power source makes no difference

* kernel 4.15.0-12 correctly powers off system only when running on AC

* kernel 4.15.0-12 does NOT power off system (reboots instead) when AC
power is NOT connected (running on battery) every time

** Summary changed:

- Kernel 4.15.0-12 reboots instead of turning off on HP Spectre x360 13-ae004
+ Kernel 4.15.0-12 reboots instead of turning off on HP Spectre x360 13-ae004 
on battery

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https://bugs.launchpad.net/bugs/1756455

Title:
  Kernel 4.15.0-12 reboots instead of turning off on HP Spectre x360
  13-ae004 on battery

Status in linux-signed package in Ubuntu:
  New

Bug description:
  Ubuntu 18.04, installed from beta 1 ISO + all updates to date

  HP Spectre x360 13", model 13-ae004na, secure boot on, latest BIOS
  F.15A, Ubuntu is the only system on disk.

  When using kernel 4.15.0-12 the system does not power off but instead
  reboots. Both halt -p from the command line and menu action leads to
  reboot. Booting with previous kernel 4.15.0-10 resolves the issue,
  system turns off power as expected.

  I am not attaching any logs because I cannot see anything unusual
  there, kern.log entries from 4.15.0-10 and 4.15.0-12 seems to be
  identical (in fact, there is only one entry there "msr: Direct access
  to MSR 1b0"). Please let me know what additional information you may
  need.

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