So, ACPI IFX0102 = chip attached via the LPC bus and exposed through ACPI firmware. 2. What It Actually Is: TPM 1.2 The IFX0102 is a TPM (Trusted Platform Module) 1.2 device, typically the Infineon SLB 9635 TT 1.2 or similar.
dmesg | grep -i tpm ls /dev/tpm* sudo tpm_version If you see TPM 1.2, Infineon , that’s your IFX0102. acpi ifx0102
PNP0C31 is the official Plug-and-Play ID for a TPM. So IFX0102 is Infineon’s vendor-specific HID, while PNP0C31 is the generic class ID. So, ACPI IFX0102 = chip attached via the
Device (TPM)
If you’ve ever dug through Windows Device Manager on an older laptop (especially an Acer, Lenovo, or Sony Vaio from the late 2000s), you might have spotted a cryptic entry under “System devices”: ACPI IFX0102 It has no obvious driver, a generic Microsoft driver sometimes attaches itself, and it occasionally sits there with a yellow exclamation mark. Most people ignore it. But what is it? A phantom chip? A relic of a forgotten security standard? A backdoor? dmesg | grep -i tpm ls /dev/tpm* sudo
Name (_HID, "IFX0102") Name (_CID, "PNP0C31") // TPM 1.2 Compatibility ID Name (_UID, 1) Method (_STA, 0, NotSerialized) Return (0x0F)