The root cause is a broken ACPI BIOS. I fixed both remaining problems by
settings "FAN always on while one AC power" in the BIOS (which is the
default value).
NOTE: This is the exact inverse settings compared to the value required
to make the "HP 8530w EliteBook Mobile Workstation" work flawlessly.
This behavior is observed using the following BIOS:
BIOS Information
Vendor: Hewlett-Packard
Version: 68CVD Ver. F.07
Release Date: 03/26/2010
[...]
BIOS Revision: 15.7
Firmware Revision: 32.41
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ACPI errors at boot (HP 8540w Elite Workstation)
https://bugs.launchpad.net/bugs/577702
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