I bought this laptop from MiniFree and while it came with Libreboot pre-installed, since December 2021, new libre (thinkpad) laptops come with osboot preinstalled. The major difference is that osboot allows CPU microcode updates and prefers free software the way Debian does (fully free by default), it is fully free when it can be fully free. If you're more on the FSF's criteria side however, you can still request to libreboot be preinstalled instead on the order's page.

Slot:	00:00.0
Class:	Host bridge [0600]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Memory Controller Hub [2a40]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20e0]
Rev:	07
IOMMUGroup:	0

Slot:	00:02.0
Class:	VGA compatible controller [0300]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Integrated Graphics Controller [2a42]
SVendor:	Lenovo [17aa]
SDevice:	Mobile 4 Series Chipset Integrated Graphics Controller [20e4]
Rev:	07
Driver:	i915
Module:	i915

Slot:	00:02.1
Class:	Display controller [0380]
Vendor:	Intel Corporation [8086]
Device:	Mobile 4 Series Chipset Integrated Graphics Controller [2a43]
SVendor:	Lenovo [17aa]
SDevice:	Mobile 4 Series Chipset Integrated Graphics Controller [20e4]
Rev:	07

Slot:	00:19.0
Class:	Ethernet controller [0200]
Vendor:	Intel Corporation [8086]
Device:	82567LM Gigabit Network Connection [10f5]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20ee]
Rev:	03
Module:	e1000e
IOMMUGroup:	1

Slot:	00:1a.0
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #4 [2937]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	2

Slot:	00:1a.1
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #5 [2938]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	2

Slot:	00:1a.2
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #6 [2939]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	2

Slot:	00:1a.7
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB2 EHCI Controller #2 [293c]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f1]
Rev:	03
ProgIf:	20
Driver:	ehci-pci
Module:	ehci_pci
IOMMUGroup:	2

Slot:	00:1b.0
Class:	Audio device [0403]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) HD Audio Controller [293e]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f2]
Rev:	03
Driver:	snd_hda_intel
Module:	snd_hda_intel
IOMMUGroup:	3

Slot:	00:1c.0
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 1 [2940]
Rev:	03
Driver:	pcieport
IOMMUGroup:	4

Slot:	00:1c.1
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 2 [2942]
Rev:	03
Driver:	pcieport
IOMMUGroup:	4

Slot:	00:1c.2
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 3 [2944]
Rev:	03
Driver:	pcieport
IOMMUGroup:	4

Slot:	00:1c.3
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) PCI Express Port 4 [2946]
Rev:	03
Driver:	pcieport
IOMMUGroup:	4

Slot:	00:1d.0
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #1 [2934]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	5

Slot:	00:1d.1
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #2 [2935]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	5

Slot:	00:1d.2
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB UHCI Controller #3 [2936]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f0]
Rev:	03
Driver:	uhci_hcd
Module:	uhci_hcd
IOMMUGroup:	5

Slot:	00:1d.7
Class:	USB controller [0c03]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) USB2 EHCI Controller #1 [293a]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f1]
Rev:	03
ProgIf:	20
Driver:	ehci-pci
Module:	ehci_pci
IOMMUGroup:	5

Slot:	00:1e.0
Class:	PCI bridge [0604]
Vendor:	Intel Corporation [8086]
Device:	82801 Mobile PCI Bridge [2448]
Rev:	93
ProgIf:	01
IOMMUGroup:	6

Slot:	00:1f.0
Class:	ISA bridge [0601]
Vendor:	Intel Corporation [8086]
Device:	ICH9M-E LPC Interface Controller [2917]
SVendor:	Intel Corporation [8086]
SDevice:	ICH9M-E LPC Interface Controller [2917]
Rev:	03
Driver:	lpc_ich
Module:	lpc_ich
IOMMUGroup:	7

Slot:	00:1f.2
Class:	SATA controller [0106]
Vendor:	Intel Corporation [8086]
Device:	82801IBM/IEM (ICH9M/ICH9M-E) 4 port SATA Controller [AHCI mode] [2929]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f8]
Rev:	03
ProgIf:	01
Driver:	ahci
Module:	ahci
IOMMUGroup:	7

Slot:	00:1f.3
Class:	SMBus [0c05]
Vendor:	Intel Corporation [8086]
Device:	82801I (ICH9 Family) SMBus Controller [2930]
SVendor:	Lenovo [17aa]
SDevice:	ThinkPad T400 [20f9]
Rev:	03
Driver:	i801_smbus
Module:	i2c_i801
IOMMUGroup:	7

Slot:	02:00.0
Class:	Network controller [0280]
Vendor:	Qualcomm Atheros [168c]
Device:	AR93xx Wireless Network Adapter [0030]
SVendor:	Apple Inc. [106b]
SDevice:	AirPort Extreme [009a]
Rev:	01
Driver:	ath9k
Module:	ath9k
IOMMUGroup:	4