model: Thinkpad T400(model id: 2182)
subtype (notebook, netbook, motherboard, tablet):
notebook
architecture:
x86-64/amd64
does it have a free boot firmware (BIOS,UEFI,...) ?
can be installed
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:
2008
compatibility with free software:
C-silver 
tested on:
Parabola GNU/Linux
Trisquel 10.0 Nabia
tested with the following kernel libre:
video card model:
(works with 3D acceleration)
wifi model:
Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection (it does not work)
webcam model:
(there is no webcam)
Description:
Internal wireless card requires non-free firmware (iwlwifi). Install unauthorized wifi cards and it won't boot. Workaround is flashing free boot firmware as stated above.
It works fine with fully free versions of Coreboot, it probably does as well with Libreboot, and works fine with Parabola and Trisquel.
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