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# Lenovo ThinkPad T14 (AMD) Gen 4

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

Reason: Missing a "Function keys" section and some IDs in the hardware table. (Discuss in Talk:Lenovo ThinkPad T14 (AMD) Gen 4)

Hardware | PCI/USB ID | Working?
--- | --- | ---
Touchpad |  | Yes
Keyboard |  | Yes
GPU |  | Yes
Webcam | `174f:11a8` | Yes
Ethernet | `10EC:8168` | Yes
Bluetooth |  | Yes
Audio |  | Yes
Wi-Fi | `17CB:1103` | Yes
Fingerprint reader | `27c6:6594` | Yes
TPM |  | Yes
NFC |  | Yes

## Firmware

### S3 Sleep

Option to enable S3 sleep is not available in the BIOS. As a result, only `s2idle` is available.

## Wireless

### Unreliable/High latency

There is an active thread in Lenovo forums regarding this issue. Possible workaround is to disable power saving mode by adding following lines and restarting `NetworkManager` service.

    /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf

    [connection]
    wifi.powersave = 2

There seems to be another issue where after some suspend/wakeup cycles the Wi-Fi card gets into a weird state where it drops almost all outgoing transmissions. This results in authentication timing out and network speeds being unusable. Removing the PCIe device using the sysfs interface and reading it seems to solve this issue:

    # lspci | grep Qualcomm
    02:00.0 Network controller: Qualcomm Technologies, Inc QCNFA765[...]
    # echo 1 > /sys/bus/pci/devices/0000:02:00.0/remove
    # echo 1 > /sys/bus/pci/rescan

### Failure to resume from hibernation

The `ath11k_pci` driver is experimental and it fails to recover the device after resuming from hibernation. There is an active bug report. The patch to fix was pending public review but has been reported to be reverted.

See Lenovo ThinkPad T14s (AMD) Gen 3#Network / Wi-Fi for a fix that unloads the `ath11k_pci` module before sleep and loads it again after resume.

## WAN

You need to FCC Unlock the Fibocom L860R aka "Intel XMM7560 LTE Advanced Pro Modem" before it can be used. To do this, you need to install thinkpad-l860-gl-fcc-unlock-binAUR. However, this tool refuses to unlock Lenovo p14s gen4 because this model is not yet certified/has not yet passed RF testing.

As of 2023-11-24 it shows the following message when trying to FCC unlock the modem:

    DPR_Fcc_unlock_service[40670]: WWAN is not supported in this machine

Fortunately, it is a very simple executable that only checks what is inside `/sys/class/dmi/id/product_family` before allowing an FCC unlock. If you want to use your Fibocom L860R you need to create:

    /etc/ModemManager/fcc-unlock.d/8086\:7560

    /usr/bin/echo ThinkPad X1 Carbon Gen 10 > product_family
    /usr/bin/chmod 600 product_family
    /usr/bin/mount -o bind product_family /sys/class/dmi/id/product_family
    /opt/fcc_lenovo/DPR_Fcc_unlock_service
    /usr/bin/umount /sys/class/dmi/id/product_family
    exit 0

Do not forget to make the file executable.

That way `/opt/fcc_lenovo/DPR_Fcc_unlock_service` will think that your laptop is a Thinkpad X1 Carbon Gen 10 and it will happily unlock the modem for you to use. Since the file is saved in `/etc/ModemManager/fcc-unlock.d/` ModemManager will FCC unlock your modem automatically every time you initialize a connection to your provider.

## Fan

The fan is relatively loud and triggers from simple web browsing.

- A first solution is thinkfan from Fan speed control, but its not yet perfect as the lowest level maps to too high RPM.
- From the fan-controll page: see gentoo link for an example, and add the proposed experimental=1

## Fingerprint reader

Fingerprint reader works out of the box with fprint. Multiple fingers can be enrolled and any one of those fingers can be used to authorize.

## Infrared camera and emitter

On models with an infrared camera, howdy can be used to enable face unlock. On some models, the IR emitter is not enabled automatically, in that case, follow the workaround from Howdy#IR emitter does not work

## Speakers

Speakers work out of the box. How ever, they won't have the same sound quality as on Windows due to the missing Dolby Atmos Convolver.

To enable Dolby Atmos Convolver install EasyEffects, go to Effects > Add Convolver > Import Impulse

The quality difference is massive, converting the speakers from sounding tinny and cheap to something actually enjoyable.

You can download the "Movie", "Music", and "Dynamic" presets here:

https://stuff.kurz.pw/arch/P14s_G4/Speakers/

They were created on a P14s G4 AMD (identical to T14) with Windows 11.

## Thunderbolt 3 compatibility

Tested with a Lenovo Thunderbolt 3 Dock (40AC) it simply worked out-of-the box (using the USB-C connector right next to the RJ45 port), resulting in new pcie devices appearing on `lspci` etc. So yes, this laptop actually has Thunderbolt 3 compatibility. As with the speaker profiles this test was done on an (identically build) P14s.

Depending on BIOS configuration thunderbolt devices might need activation before being usable, e.g. using `bolt`. For that run `boltctl list` first to retrieve the devices UUID. After that use `boltctl enroll --policy=auto <uuid>` to enable the device.

## NFC

Install and start neardAUR. Detected NFC tags should appear as D-Bus objects. Use the scripts from the test directory for reading NFC tags.

## Other issues

### Hang on splash

This article or section needs expansion.

Reason: The splash option is GRUB-specific: it should be determined whether the issue is hardware related (and should be kept here) or GRUB-related (and should be merged to the GRUB page). (Discuss in Talk:Lenovo ThinkPad T14 (AMD) Gen 4)

Remove `quiet splash` from the kernel parameters.

### Mic LED always on

See Lenovo ThinkPad T14 (AMD) Gen 3#Mute Mic LED always on.

### OLED screen not allowing 90Hz

If only 60Hz is allowed in display settings, add `amdgpu.dcdebugmask=0x8000` to the kernel parameters. This fixes a regression in Linux 6.13 that populates the screen's EDID info with a manufacturer's preferred settings.

### Display brightness resets

On models with 2.8K OLED pannel, display brightness resets if the screen is blanked and unblanked. This is fixed in `linux-6.6` and above.

### Display stays off after lid close

If your display stays off after closing and then opening the lid, there are few things to note:

- the laptop is not crashed, it is just the display that does not turn itself on again

- you need to "re-initialize" the display in some way, e.g. connecting the laptop via the HDMI port to an external display and then disconnecting

- or switching resolution or (even better) just the refresh rate. This is how this solution works.

Install acpid and then edit the following file and add the lines starting with XDG_Session:

/etc/acpi/handler.sh

       button/lid)
           case "$3" in
               close)
                   logger 'LID closed'
                   ;;
               open)
                   logger 'LID opened'
                   XDG_SESSION_TYPE=wayland XDG_RUNTIME_DIR=/run/user/1000 kscreen-doctor output.eDP-1.mode.1 output.eDP-1.enable
                   XDG_SESSION_TYPE=wayland XDG_RUNTIME_DIR=/run/user/1000 kscreen-doctor output.eDP-1.mode.0 output.eDP-1.enable
                   ;;
               *)
                   logger "ACPI action undefined: $3"
                   ;;
       esac

If you have the 2.8k OLED display this will switch the display to 2880x1800 @ 60Hz and then to 2880x1800 @ 90 Hz every time you open the lid. That way your display gets re-initialized. Note that this solution is only for Wayland. If you are still using X, you will need other environment variables.

### Smartcard reader hang

Sometimes the built in smartcard reader stops responding (`LIBUSB_ERROR_TIMEOUT`). Fix is to power-cycle the card reader by suspend or by toggling power of the internal usb port using uhubctlAUR.

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Lenovo ThinkPad T14 (AMD) Gen 4
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