Lenovo ThinkPad P1 (Gen 4)

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Reason: Misses IDs in the hardware table, an accessibility and function key section, firmware needs expansion. (Discuss in Talk:Lenovo ThinkPad P1 (Gen 4))
Hardware PCI/USB ID Working?
Touchpad Yes
Keyboard Yes
GPU (NVIDIA) Yes
GPU (Intel) Yes
Webcam Yes
Bluetooth Yes
SD-card reader Yes
Audio Yes
Wireless Yes
Fingerprint reader Yes
TPM Untested

Firmware

The device supports fwupd.

Brightness control

OLED Display

OLED screens have no backlight, brightness cannot be controlled by changing backlight power in the traditional way. Instead, it can be controlled using PWM by enabling following option:

echo "options i915 enable_dpcd_backlight=1" >> /etc/modprobe.d/i915.conf

Alternatively, you can add a kernel parameter. For example, if you are using GRUB, edit /etc/default/grub with

GRUB_CMDLINE_LINUX_DEFAULT="i915.enable_dpcd_backlight=1"

Do not forget to update the grub configuration to apply the changes.

LCD Display

Hybrid Graphics

Hybrid Graphics (also known as Nvidia Optimus) Allows the system to use the integrated Intel graphics and the Nvidia GPU interchangeably without rebooting.

Brightness control under Hybrid Graphics should work "out of the box" with no kernel command line options necessary. If you notice brightness controls cease working, check that your BIOS settings are still for "Hybrid Graphics" and not "Discrete Graphics".

Discrete Graphics

Discrete graphics means only the Nvidia GPU is available to the system.

Currently brightness control does not work with "Discrete Graphics" selected in BIOS.