Lenovo ThinkPad T490s

Device	Status
Intel graphics	Yes
Wireless	Yes
ALSA	Yes
TrackPoint	Yes
Touchpad	Yes
Webcam	Yes
Bluetooth	Yes
Mobile internet	not tested
Fingerprint Sensor	Yes
MicroSD Reader	not tested

Hardware

 Manufacturer: LENOVO
 Product Name: 20NX001RUS
 Version: ThinkPad T490s
 SKU Number: LENOVO_MT_20NX_BU_Think_FM_ThinkPad T490s
 Family: ThinkPad T490s

Additional hardware information from lsusb and lspci can be found bellow:

lsusb

Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 06cb:00bd Synaptics, Inc. 
Bus 001 Device 002: ID 04ca:7070 Lite-On Technology Corp. Integrated Camera
Bus 001 Device 004: ID 8087:0aaa Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

lspci

00:00.0 Host bridge: Intel Corporation Coffee Lake HOST and DRAM Controller (rev 0c)
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 620 (Whiskey Lake) (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 0c)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:12.0 Signal processing controller: Intel Corporation Cannon Point-LP Thermal Controller (rev 30)
00:14.0 USB controller: Intel Corporation Cannon Point-LP USB 3.1 xHCI Controller (rev 30)
00:14.2 RAM memory: Intel Corporation Cannon Point-LP Shared SRAM (rev 30)
00:14.3 Network controller: Intel Corporation Cannon Point-LP CNVi [Wireless-AC] (rev 30)
00:16.0 Communication controller: Intel Corporation Cannon Point-LP MEI Controller #1 (rev 30)
00:1c.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #1 (rev f0)
00:1c.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #5 (rev f0)
00:1d.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #9 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #13 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Cannon Point-LP LPC Controller (rev 30)
00:1f.3 Audio device: Intel Corporation Cannon Point-LP High Definition Audio Controller (rev 30)
00:1f.4 SMBus: Intel Corporation Cannon Point-LP SMBus Controller (rev 30)
00:1f.5 Serial bus controller [0c80]: Intel Corporation Cannon Point-LP SPI Controller (rev 30)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (6) I219-V (rev 30)
01:00.0 SD Host controller: Genesys Logic, Inc GL9750 SD Host Controller (rev 01)
02:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
03:00.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
03:01.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
03:02.0 PCI bridge: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] (rev 01)
04:00.0 System peripheral: Intel Corporation JHL6240 Thunderbolt 3 NHI (Low Power) [Alpine Ridge LP 2016] (rev 01)
3a:00.0 USB controller: Intel Corporation JHL6240 Thunderbolt 3 USB 3.1 Controller (Low Power) [Alpine Ridge LP 2016] (rev 01)
3d:00.0 Non-Volatile memory controller: Sandisk Corp Device 5006

BIOS

This article or section needs expansion.

Reason: Transfer any relevant information from Lenovo ThinkPad T490. (Discuss in Talk:Lenovo ThinkPad T490s#)

FN Keys

Most FN keys should work out of the box, but if it doesn't, bind mentioned keys to below commands:

F1 button: amixer set Master toggle.
F2 button: amixer set Master 5%-.
F3 button: amixer set Master 5%+.
F4 button: amixer set Capture toggle.

Touchpad

Touchpad works. But some users have reported issues with the related Lenovo ThinkPad T490#Touchpad.

Sometimes the kernel may use an incorrect mode for communicating with the touchpad, causing the touchpad to completely cease working. This could happen after upgrading the firmware in Windows. This could be indicated by something like following in the kernel log.

# dmesg

[ 2.874664] elan_i2c 0-0015: 0-0015 supply vcc not found, using dummy regulator

A workaround is to load the psmouse module with elantech_smbus=0 option. You can do so by creating a file /etc/modprobe.d/psmouse.conf with the following content:

/etc/modprobe.d/psmouse.conf

options psmouse elantech_smbus=0

or by applying the psmouse.elantech_smbus=0 kernel parameter. See FS#59714 for more info.

Fingerprint Sensor

The fingerprint sensor works with some recent firmware and software updates.

Use fwupd to install the latest firmware for "Synaptics Prometheus Fingerprint Reader". The update might have to be done manually as the released firmware is in testing; or you could enable the testing remote in fwupd to allow automated upgrade. The relevant firmwares are Prometheus Fingerprint Reader and Prometheus Fingerprint Reader Configuration.
fprintd ≥ 1.90.1 and libfprint ≥ 1.90.1 are required. Alternatively, use the latest Git master through fprintd-libfprint2^AUR and libfprint-git^AUR.

fprint has more details on how to setup the fingerprint, for PAM-based authentication for example.

Known Issues

ACPI

The default /etc/acpi/handler.sh script has a check for the device that looks like this:

ac_adapter)
        case "$2" in
            AC|ACAD|ADP0)

This will not work, since the T490s device is called ACPI0003:00 which is not matched by the above check. The instructions in Acpid does mention a pattern that does work and it is recommended to use this instead.