Q:

How can I get more information about ACPI devices?

Recently I noticed that my Linux installation was loading at least one module that seems unnecessary to my system. The module in question is fjes, for the FUJITSU Extended Socket Network Device Driver.
This module matches with the following devices in /sys:

/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/PNP0C02:03
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C02:01
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/INT3F0D:00
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C02:02
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/PNP0C02:00

I want to know how I can get the following information about those devices:

What kind of devices are those?
What are their manufacturers?

For fairness, I have another open question related to this. But in that question I wanted to know why I had so many different devices with a single modalias. Now I want to make sure that none of them are really related to the fjes module. My ultimate intetion is to open a bug report, so I want to be sure I'm not overseeing something silly.

A:

Those are Plug and Play devices, AFAIK named after the legacy from the ISA bus era, but today identified by ACPI. 
You can get information about them using lspnp (with added -v option), or directly from the /sys/bus/pnp/devices or /proc/bus/pnp tree. 
PNP0c02 is a "motherboard resources" entry and INT3f0d seems to be a Intel Watchdog Timer. Googling for the name also often finds matching Windows drivers, which may help in identifying. 
I guess all the classes should also be listed in the PCI standard, but I didn't check.

