Lenovo ThinkPad T14 (AMD) Gen 2

From ArchWiki
Hardware PCI/USB ID Working?
Trackpoint Yes
Touchpad Yes
Keyboard Yes
GPU 1022:1638 Yes
Webcam 04f2:b724 Yes
Ethernet 10ec:8168 Yes
Bluetooth 0bda:4852 Yes
MicoSD-card reader 17a0:9750
10ec:522a 		Yes
Audio 1022:15e2 Yes
Wireless 10ec:8852 Yes
Wireless WAN 1eac:1001 Yes
TPM 1022:15df Yes
Fingerprint reader 06cb:00bd Yes
Smartcard reader 058f:9540 Yes
NFC reader ??? No

Accessibility

High contrast black on white with large type. Unfortunately the selected menu item is indicated with faint dotted lines, which would make it hard to read for those with visual limitations. Under the Config tab, there is a Setup UI item that toggles the BIOS look-and-feel back to the old-school Thinkpad grey-blue-and-white, all-text, keyboard navigation mode, which may be easier. A table of navigation keys is found under the heading "Navigate in the UEFI BIOS interface" on p.31 of the user guide.

Note: Blind users should request the help of a sighted person to change BIOS settings.

This device has no diagnostic LEDs but relies on audible beep codes. However, those codes can be translated into visible form by using Lenovo's SmartBeep app. This is described under the heading "Beep errors" on p.53 of the user guide.

Firmware

fwupd

fwupd supports the UEFI BIOS, the webcam, the fingerprint reader and the NVMe controller.

November 2021 security update

On November 4, 2021 Lenovo pushed System Firmware Version 1.12, a UEFI/BIOS update, to LVFS. This is described as a security update (although without further detail). See LVFS page for this update.

Secure boot

For a number of Lenovo laptops of the same cohort, it has been reported that deleting SecureBoot keys and substituting your own keys bricks the motherboard. Further, Lenovo classifies this as caused-by-customer and thus outside the scope of warranty coverage. See here for Lenovo forum threads on XC17,T14s and T14 (AMD) Gen 1.

You break it, you keep both pieces.

Note that keeping the Lenovo Certificates should not brick the machine according to this thread.

Realtek Ethernet

lspci shows two distinct Ethernet controllers: 

$ lspci | grep Ethernet
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0e)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)

enp5s0 is the RJ45 port. enp2s0f0 is the proprietary connector next to the 2nd USB Type-C port for use in the Lenovo ThinkPad Ultra Docking Station or with a Lenovo ThinkPad Ethernet Extension Cable Gen 2 cable.

Check ip link to see what interface has carrier and then set up that interface. 

$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp2s0f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether 38:f3:ab:f4:0a:b9 brd ff:ff:ff:ff:ff:ff
3: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 38:f3:ab:f4:0a:b8 brd ff:ff:ff:ff:ff:ff
4: wlp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
    link/ether 14:5a:fc:1b:d5:15 brd ff:ff:ff:ff:ff:ff

Wireless WAN / Quectel EM120R-GL

According to the service manual the only supported WWAN card is the Quectel EM120R-GL.

This modem is confirmed working after following the FCC unlock procedure outlined in the ThinkPad mobile Internet#FCC unlock a Quectel modem page.

Unreliable mic mute LED

The mic mute LED on key F4 stays on even when the mic is live. This is a problem shared by the AMD Gen 1 T14 as well, per the relevant thread in the Lenovo Ubuntu support forum. Confirm the actual status of the mic before saying anything you may come to regret on a Zoom call.

Synaptics touchpad RMI bus non-functional

The Synaptics touchpad uses the psmouse module rather than its native RMI bus, which is qualitatively superior. dmesg says: 

[    2.148382] psmouse serio1: synaptics: queried max coordinates: x [..5678], y [..4694]
[    2.184193] psmouse serio1: synaptics: queried min coordinates: x [1266..], y [1162..]
[    2.184214] psmouse serio1: synaptics: Your touchpad (PNP: LEN2073 PNP0f13) says it can support a different bus. If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.

Following that advice by adding psmouse.synaptics_intertouch=1 to the kernel command line results in a different complaint: 

[    2.217261] psmouse serio1: synaptics: Trying to set up SMBus access
[    2.220337] psmouse serio1: synaptics: SMbus companion is not ready yet.

For more, see the relevant thread in the Lenovo Ubuntu forums and related kernel bug report.

Freezing Trackpad

The trackpad may freeze randomly. The cure is to unload the psmouse module with rmmod and reload it with modprobe.

Fingerprint reader unavailable after suspend

There have been reports that while the fingerprint reader works well with fprintd after a cold start (including wake from hibernation) it vanishes from the list of available devices after sleep or suspend. As of July 2022, with the latest system firmware updates applied, this issue now seems to be resolved.

AMD P-State

Starting with kernel 5.17, AMD processors should have more finesse in frequency control due to the inclusion of the AMD p-states driver. Starting with kernel 6.3, the AMD p-states driver provides EPP (energy preference performance) which provides a hint to the hardware if software wants to bias toward performance or energy efficiency. Starting with kernel 6.4, the AMD p-states driver provides a guided mode in which the driver requests minimum and maximum performance level and firmware autonomously selects a performance level in this range and appropriate to the current workload.

Unfortunately, the acpi_cpufreq driver does not play well with others. To get it working:

  • Blacklist acpi_cpufreq by adding the entry acpi_cpufreq to the /etc/modprobe.d/blacklist.conf file;
  • Add amd_pstate=passive, amd_pstate=active or amd_pstate=guided to your kernel boot options.

Confirm if it has worked by running cpupower frequency-info to confirm the driver being used. You can also load the amd_pstate_ut module and review dmesg to confirm that the driver passed the relevant tests.

Note that the amd_pstate driver is now a boolean option in the kernel configuration and can no longer be built as a module.

For those using TLP to manage power, AMD p-state performance is slated for inclusion in the 1.06 release. For the impatient, switch to tlp-gitAUR in the AUR.

Sleep mode (S3)

Sleep mode and, in particular, the lid switch are slow and flaky unless the sleep mode is set to Linux rather than Windows 10 in the UEFI. Be sure that you have logged out of, rather than suspending, any Windows installation before changing this.

See Power management/Suspend and hibernate for more details.

Function keys

Key Visible? Marked? 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 XF86NotificationCenter
F10 Yes Yes XF86PickupPhone
F11 Yes Yes XF86HangupPhone
F12 Yes Yes XF86Favorites
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
Fn+Left Arrow Yes No Home
Fn+Right Arrow Yes No End

PCI Express Card Reader

The on-board reader requires the rtsx_pci_sdmmc kernel module to be loaded. This can be enabled at boot by adding a file in /etc/modprobe.d/ with the module name.

Touchscreen

Blacklist kernel module raydium_i2c_ts to make touchscreen work.

See BBS#274704 for more information.

See also