03-20-2011
You want to write a UNIX operating system from scratch for this, covering all possible hardware in the "old laptop" spectrum? I'm pretty sure there already are operating systems that run on old laptops, and it's taken decades of continuous effort to get them where it is already. Pretty sure you don't have that kind of time or developer base.
I don't think old laptops are even very GOOD at digital audio. Built-in sound devices are invariably garbage.
Just make a linux distro. You don't want auto-update? You have full control over what you include, rip it out. (And put up with the same program bugs forevermore, but whatever -- you must know what "no updates ever" implies if you asked for it.)
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LEARN ABOUT NETBSD
wmidell
ACPIWMI(4) BSD Kernel Interfaces Manual ACPIWMI(4)
NAME
acpiwmi -- Windows Management Instrumentation support for ACPI
SYNOPSIS
acpiwmi* at acpi?
acpiwmibus* at acpiwmi?
wmidell* at acpiwmibus?
wmieeepc* at acpiwmibus?
wmihp* at acpiwmibus?
wmimsi* at acpiwmibus?
DESCRIPTION
The acpiwmi device driver provides an ACPI interface for Windows Management Instrumentation (WMI). The ACPI WMI interface is typically used
to support vendor specific features found in various laptops.
The following WMI mappings are supported:
wmidell Dell laptops
wmieeepc Some models of Asus Eee PC
wmihp Hewlett-Packard laptops
wmimsi MSI laptops
The functionality varies from vendor to vendor. Typically the interface is used for function and hotkey handling, but additional features
may be present.
SEE ALSO
acpi(4), acpidalb(4)
Microsoft Corporation, Windows Instrumentation: WMI and ACPI, http://www.microsoft.com/whdc/system/pnppwr/wmi/wmi-acpi.mspx, December 4,
2001.
HISTORY
The acpiwmi device driver appeared in NetBSD 6.0.
AUTHORS
Jukka Ruohonen <jruohonen@iki.fi> wrote acpiwmi and most of the mappings.
CAVEATS
While WMI should provide a certain degree of portability across laptop models from a particular vendor, there is no guarantee that the map-
pings are functional in all models.
The wmihp driver may conflict with hpqlb(4).
BSD
February 16, 2011 BSD