Dell Latitude 5491

Resources

The Dell Latitude 5491 is a 14" laptop with 8th generation Intel Core i5/i7 CPU and a dedicated NVidia GeForce MX130 GPU.

Hardware

Standard

Device	Make/model	Status	Vendor ID / Product ID	Kernel driver(s)	Kernel version	Notes
CPU	Intel Core i5/i7 8th gen.	Works			5.4.38
PCIe controller	Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller	Works		pcieport	5.4.38	Twice
PCIe controller	Intel Corporation Cannon Lake PCH PCI Express Root Port	Works		pcieport	5.4.38	Twice, once used for the Alps synaptics
Video	Intel Corporation UHD Graphics 630	Works		i915	5.4.38
Video	NVidia GeForce MX130 (GM108M)	Works		nouveau or nvidia	5.4.38	Tested with proprietary drivers
Audio	Intel Corporation Cannon Lake PCH cAVS	Works		snd_hda_intel	5.4.38
Ethernet	Intel Corporation Ethernet Connection I219-LM	Works		e1000e	5.4.38
WiFi	Intel Corporation Wireless-AC 9560 [Jefferson Peak]	Works		iwlwifi	5.4.38	Requires firmware
WWAN	Sierra Wireless, Inc. DW5811e Snapdragon™ X7 LTE	Not tested	413c:81b6
Bluetooth	Bluetooth	Works	8087:0aaa	btusb	5.4.38
USB controller	Intel Corporation Cannon Lake PCH USB 3.1 xHCI Host Controller	Works		xhci_hcd	5.4.38
Sata controller	Intel Corporation 82801 Mobile SATA Controller	Works		ahci	5.4.38
SD card reader	Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader	Works		rtsx_pci	5.4.38	Does not detect the insertion & removal of the SD card straight away
Webcam	Sunplus Innovation Technology Inc.	Works	1bcf:2b96	uvcvideo	5.4.38
Fingerprint reader	Broadcom Corp 5880	Not tested	0a5c:5834
Thermal	Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem	Works		proc_thermal	5.4.38
Thermal	Intel Corporation Cannon Lake PCH Thermal Controller	Works		intel_pch_thermal	5.4.38
	Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model	Not working			5.7.38	Linux hardware status
I2C controllers	Intel Corporation Cannon Lake PCH Serial IO I2C Controller	Works		intel-lpss	5.4.38	Twice
SMBus	Intel Corporation Cannon Lake PCH SMBus Controller	Works		i801_smbus	5.4.38

For hardware probes see https://linux-hardware.org/index.php?view=computers&vendor=Dell&model=Latitude+5491

Installation

Firmware

The Linux firmware package will have to be installed, for certain components to work properly

root #emerge --ask sys-kernel/linux-firmware

iwlwifi-9000-pu-b0-jf-b0-34.ucode
i915/skl_dmc_ver1_27.bin

And add them space-separated in the kernel firmware selection:

KERNEL Enable firmware

Device Drivers  --->
    Generic Driver Options  --->
        (iwlwifi-9000-pu-b0-jf-b0-34.ucode i915/skl_dmc_ver1_27.bin) External firmware blobs to build into the kernel binary
        (/lib/firmware) Firmware blobs root directory

Microcode

Be sure to follow the Wiki page on how to load the Intel microcode

Kernel

Touchpad

To set the touchpad and keyboard knob in the kernel, do the following.

KERNEL Enable support for touchpad and knob

Device Drivers  --->
     I2C support  ---> 
         I2C Hardware Bus support  --->
              <*> Synopsys DesignWare Platform
     Multifunction device drivers  --->
              <*> Intel Low Power Subsystem support in PCI mode
     HID support  --->
         I2C HID support  --->
             <*> HID over I2C transport layer

Do not forget to add the libinput in the INPUT_DEVICE variable of the /etc/portage/make.conf file:

FILE /etc/portage/make.conf

INPUT_DEVICES="libinput"

Here is what is excpected:

user $user ~ # dmesg

[    2.075357] mousedev: PS/2 mouse device common for all mice
[    2.190180] input: DELL0818:00 044E:121F Mouse as /devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-9/i2c-DELL0818:00/0018:044E:121F.0001/input/input7
[    2.190347] hid-multitouch 0018:044E:121F.0001: input,hidraw0: I2C HID v1.00 Mouse [DELL0818:00 044E:121F] on i2c-DELL0818:00

SD card reader

KERNEL Enable support for the SD card reader

Device Drivers  --->
     Multifunction device drivers  --->
         <*> Realtek PCI-E card reader
     <*> MMC/SD/SDIO card support  --->
         <*>   Realtek PCI-E SD/MMC Card Interface Driver

Webcam

KERNEL Enable support for the webcam

Device Drivers  --->
    <*> Multimedia support  --->
        [*]   Media USB Adapters  --->.
            <*>   USB Video Class (UVC)

And add a user to the video group to access the /dev/video0.

root #gpassword -a <user> video