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Hardware | PCI/USB ID | Working?
--- | --- | ---
Bluetooth (Intel) | `8087:0a2a` | Yes
Bluetooth (Realtek) | `0bda:8761` | Untested
Webcam (Acer) | `5986:0366` | Yes
Webcam (Chicony)m | `04f2:b596` | Yes
Webcam (Chicony)s | `04f2:b39a` | Yes
Webcam (Chicony) | `04f2:b449` | Yes
Webcam (Lite-On) | `04ca:703c` | Yes
Ethernet | `8086:15a3` | Yes
`8086:15a2` | Yes
WLAN (Intel) | `8086:095b` | Yes
WLAN (Realtek) | `10ec:818b` | Yes
WWAN (Ericsson) | `0bdb:193e` | Untested
WWAN (Sierra) | `1199:a001` | Untested
GPU (Intel)m | `8086:0a16` | Yes
GPU (Intel) | `8086:1616` | Yes
GPU (NVIDIA)s | `10de:1347` | Untested
Touchpad |  | Yes
Touchscreenm | Unknown | Untested
Touchscreens | `04f3:0418` | Yes
Trackpoint |  | Yes
Keyboard |  | Yes
TPM |  | Untested
Fingerprint reader | `138a:0017` | Yes
Smart card reader | `058f:9540` | Untested
SD card reader | `10ec:5227` | Yes
Audiom | `8086:9c20` | Yes
Audio | `8086:9ca0` | Yes

A laptop page for the Lenovo ThinkPad T450 and the Lenovo ThinkPad T450s. Entries in the hardware table marked with m are exclusive to the mainstream T450 while those marked with s are exclusive to the slimmer T450s.

## Accessibility

The appearance of the ThinkPad Setup program (i.e., the tool used to configure UEFI BIOS settings) is simple and uses contrasting colours, so it may work well with OCR software. A legend of keyboard navigation shortcuts is also clearly listed on the bottom of the screen.

Note: Blind users should request the help of a sighted person to change UEFI BIOS settings. Keyboard beeps in the ThinkPad Setup program are enabled by default but only happen when unmanageable/invalid key combinations are pressed.

The user guide has a section under Chapter 6, "Advanced configuration", titled "Using the ThinkPad Setup program" that highlights the steps needed to configure the UEFI BIOS settings. Relevant keyboard shortcuts (including those needed to trigger certain features on device startup) are mentioned throughout:

Key | Effect
--- | ---
`Enter` | Interrupt normal startup and bring up the Startup menu
`F1` | Start the ThinkPad Setup program
`F12` | Bring up the Boot Menu window

## Firmware

fwupd does not support this device yet.

### UEFI BIOS errors

The following error messages appear during the boot process and in the system's journal (see [1]):

    # journalctl -kp err

    DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x000000009d800000-0x000000009fffffff], contact BIOS vendor for fixes
    ACPI Error: Needed type [Reference], found [Integer] 00000000e2dee060 (20201113/exresop-66)
    ACPI Error: AE_AML_OPERAND_TYPE, While resolving operands for [Store] (20201113/dswexec-431)
    ACPI Error: Aborting method \_PR.CPU0._PDC due to previous error (AE_AML_OPERAND_TYPE) (20201113/psparse-529)

These messages appear because "there is an attempt to store an integer to a reference type in the bytecode" [2]. A Lenovo forum thread was made to discuss and bring this to Lenovo's attention, but they have yet to fix it.

However, these firmware errors do not seem to have any obvious consequences (besides the hampered functionality of the _PDC ACPI object), so it is probably safe to disregard them. `loglevel=3` can be passed as a kernel parameter to hide these errors (and others) during the boot process.

## Wireless

See Lenovo ThinkPad T440s#Wireless; the T450/T450s and T440s share the same Realtek-variant WiFi card.

## SD card reader

See Lenovo ThinkPad T440s#SD card reader; the T450/T450s and T440s share the same SD card reader (but with different sub-device IDs). See also https://linux-hardware.org/?id=pci:10ec-5227-17aa-5034.

## Power management

### Intel Rapid Start Technology (IRST)

Some T450/T450s models come equipped with both an HDD and the optional 16GB M.2 SSD. The user guide advises against formatting the M.2 SSD as a bootable device (in Chapter 6, "Advanced configuration") because one of its purposes (in OEM deployments of Windows) is to "support the Intel Rapid Start Technology." The M.2 SSD can still be used for that same purpose in an Arch Linux installation if so desired. See Suspend and hibernate#Intel Rapid Start Technology (IRST) for more details.

### Panel Self-Refresh (PSR)

Enabling Panel Self-Refresh (PSR) may decrease the power consumption of the Intel chipset.

Warning: PSR can completely freeze the screen on the T450/T450s (rendering it nearly inoperable). Disable it if so—chrooting from a rescue USB may be necessary.

## CapsLock indicator

There is no LED indicator for the `CapsLock` key, but software-based solutions for desktop environments exist; for example:

- gnome-shell-extension-lockkeys-gitAUR
- Locking Keys panel in KDE
- xfce4-kbdleds-pluginAUR

The Caps Lock state can also be read and controlled through a sysfs(5) pseudo-file that takes on values of `0` or `1`:

    /sys/class/leds/input3::capslock/brightness

## Function keys

Key | Visible?1 | Marked?2 | Effect
--- | --- | --- | ---
`Fn+Esc` | Yes | Yes | Toggles Fn lock
`F1` | Yes | Yes | `XF86AudioMute`
`F2` | Yes | Yes | `XF86AudioLowerVolume`
`F3` | Yes | Yes | `XF86AudioRaiseVolume`
`F4` | Yes | Yes | `XF86AudioMicMute`
`F5` | Yes | Yes | `XF86MonBrightnessDown`
`F6` | Yes | Yes | `XF86MonBrightnessUp`
`F7` | Yes | Yes | `XF86Display`
`F8` | Yes | Yes | `XF86WLAN`
`F9` | Yes | Yes | `XF86Tools`
`F10` | Yes | Yes | `XF86Search`
`F11` | Yes | Yes | `XF86LaunchA`
`F12` | Yes | Yes | `XF86Explorer`
`Fn+Space` | No | Yes | Controls the keyboard backlight
`Fn+b` | Yes | No | `Control_L+Break`
`Fn+k` | Yes | No | `Scroll_Lock`
`Fn+p` | Yes | No | `Pause`
`Fn+s` | Yes | No | `Alt_L` `Alt_L+Sys_Req`
`Fn+4` | Yes | No | `XF86Sleep`
`Fn` | Yes | No | `XF86WakeUp`

1. The key is visible to `xev` and similar tools.
2. The physical key has a symbol on it, which describes its function.

Tip: By default, the function keys behave as multimedia keys instead of actual function keys. This behaviour can be changed in the UEFI BIOS settings so that `F1` to `F12` are used as standard function keys and special multimedia features are only triggered with the use of the `Fn` key.
Note: Although Fn lock state persists across reboots, the function keys will always behave as standard function keys during device startup.

## See also

- Lenovo ThinkPad T550

### T450 links

- https://www.thinkwiki.org/wiki/Category:T450
- Product Specifications Reference (PSREF)
- Hardware maintenance manual
- User guide

### T450s links

- https://www.thinkwiki.org/wiki/Category:T450s
- Resources provided by Lenovo
  - Product Specifications Reference (PSREF)
  - Hardware maintenance manual
  - User guide
- Installation guides and blog posts for other distributions
  - Debian:InstallingDebianOn/Thinkpad/T450s/jessie
  - Fedora 21: The Lenovo T450s Is Working Beautifully With Linux - Phoronix

Category:

- Lenovo