model: ThinkPad T61(model id: 459)
subtype (notebook, netbook, motherboard, tablet):
notebook
does it have a free boot firmware (BIOS,UEFI,...) ?
no
can free operating systems be installed?
yes
does the device prevent installing wifi cards not-approved by the vendor?
yes (see the details inside the description entry)
year of commercialization:
2007
compatibility with free software:
C-silver 
tested on:
Trisquel 5.0 Dagda
tested with the following kernel libre:
2.6.38-11-generic
video card model:
Intel GMA X3100 GM965 (works with 3D acceleration)
wifi model:
Intel PRO/Wireless 3935ABG [Golan] (it does not work)
Description:
Wifi card whitelist
All thinkpads have a Wifi card whitelist at the BIOS level that prevent installing certain WiFi cards. The restriction can be bypassed with a BIOS modification: either installing Libreboot, Coreboot or editing the official Lenovo/IBM BIOS.
The contents of this page are in the Public Domain. (see the
CC0 page for detailed information). Anyone is free to copy, modify, publish, use, sell, or distribute the text for any purpose, commercial or non-commercial, and by any means.
