Lenovo ThinkPad T25 - ArchWiki

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# Lenovo ThinkPad T25

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This article or section does not follow the Laptop page guidelines.

Reason: Hardware table needs IDs and a function keys section should be added (Discuss in Talk:Lenovo ThinkPad T25)

This article or section is a candidate for merging with Lenovo ThinkPad T470.

Notes: The page for the Lenovo ThinkPad T470 has more content and was updated more regularly than this one. (Discuss in Talk:Lenovo ThinkPad T25)

Hardware | PCI/USB ID | Working?
--- | --- | ---
GPU (Intel) |  | Yes
GPU (Nvidia) |  | Yes
Wireless |  | Yes
Bluetooth |  | Yes
Mobile broadband |  | Yes
Webcam |  | Yes
IR Camera |  | Yes
TrackPoint |  | Yes
Touchpad |  | Yes
Touchscreen |  | Yes
Fingerprint Reader |  | No

This article covers the installation and configuration of Arch Linux on a Lenovo T25 Anniversary Edition laptop. It is based on the Lenovo T470 laptop so most of the hardware is identical and therefore should work like the T470.

For a general overview of laptop-related articles and recommendations, see Laptop.

## Firmware (e.g. bios and peripherals)

As of writing, the current BIOS version is 1.54. By visiting the downloads section (T25) an ISO can be downloaded and burned to disk which will perform the update from Lenovo. Or extracted and copied on a USB Stick.

## Kernel and hardware support

Hardware video acceleration with Kaby Lake seems to work fine via va-api.

As noted in Intel graphics, the xf86-video-intel driver seems to cause more issue than the builtin `modesetting` Xorg driver. Works fine without the intel driver (on a Skylake configuration).

138a:0097 will hopefully be supported as part of Validity90. Since the hardware is the same as in the T470 model, the fingerprint reader guide probably will work.

### Screen backlight

With the `intel` driver (xf86-video-intel the `xbacklight` brightness control is not working. It is possible that, with the good `acpi_*` kernel parameters, the backlight related keys do their job.

Other workaround exists, such as described on this post or in the wiki acpid#Enabling backlight control. Using the acpilight package as a `xbacklight` replacement works well. You can also check this repository as a base to add the ACPI rules to call `xbacklight` when backlight keys are pressed.

Note: The acpilight package is known to allow controlling the ThinkPad keyboard backlight. Similar ACPI rules should allow to toggle it when the keyboard backlight key is pressed.

### UEFI boot

After configuring the BIOS setup to allow UEFI boot (either UEFI only or both), it works flawlessly.

### Special buttons

See Laptop/Lenovo#Special buttons, an additional key has to be added for this model:

Key combination | Scancode | Keycode
--- | --- | ---
`Fn+Space` | `0x13` | `372` `KEY_ZOOM`

### Touchpad and trackpoint

Touchpad and trackpoint share bandwidth, so using them at the same time makes trackpoint slow, jumpy, and abrupt. Disabling the touchpad either in BIOS or via xinput does not fix the problem, so the trackpoint becomes unusable each time the touchpad is occasionally touched.

The touchpad is also accessible over secondary bus (SMBUS/RMI), allowing to leave the full bandwidth for the trackpoint. The kernel source code contains the whitelist of supported devices, which does not include LEN008e (T25 touchpad). You can enforce this feature setting `synaptics_intertouch` parameter of `psmouse` module to `1`. For instance, using the kernel command line: `psmouse.synaptics_intertouch=1`.

## See also

- Lenovo Support Page

Category:

- Lenovo

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