[Samsung Galaxy S9 & S9+ Cross Device Development] abtekk:
What's working:

Wi-Fi

Bluetooth

Mobile Network (Calling, Data, etc.)

Audio (Stereo Speakers)

Camera

Fingerprint Sensor

S-Pen Basics

Call Recording

HWC

Signal Indicator

GPS

Sensors

HDMI

NFC

What's not working:

Iris sensor does not work because AOSP upstream does not support that yet.

IMS services (VoLTE, VoWiFi, etc). Samsung has their own proprietary implementation. It is not really possible to easily port that to LineageOS.

Bugs:

S-Pen/Mouse will cause small graphical glitches during button animations sometimes.

Signal Indicator

Instructions:

Make sure TWRP has been installed and functional

Reboot to recovery

Wipe data and cache (required if you switch from other ROMs)

Flash the latest build (then gapps and magisk if needed)

Reboot

THE VENDOR.IMG IS PROVIDED AS PART OF THE ROM. FLASHING ANOTHER VENDOR WILL CAUSE A BOOTLOOP.

How to update builds?

Do not wipe anything unless stated in the changelog

Flash only the rom.zip and it will automatically reinstall your gapps, magisk, vendor etc

use /system/addon.d if you would like to keep system mods after an update

Downloads:

Galaxy S9 (Exynos): https://mega.nz/#!3nIU2AyL!gHNXB_xod1Fii9lROvLnKfTQz_BR8hHddPX5jUeAi-4

Galaxy S9+ (Exynos): https://mega.nz/#!LmQgWSLK!Cttp_5IGELXiYFvbBG9wNOIYxPybBXyzuA8QxtHRaj0

Google Apps: https://opengapps.org/

If you get booting and or wifi issues with this new build, I would recommend a completely clean flash. It would appear some things have changed upstream in Lineage & Magisk that are causing issues.

Changelog:

09/01/2019

Fixed NFC (Requires factory reset if on earlier build)

WiFi should behave a bit more.

23/12/2019

Hardware decoding of UHD video no longer lags/stutters

Bluetooth call audio working

UHD video recording with the camera app fixed

Built against LOS december sources

20/12/2019

Wifi tethering now works

Kernel upstreamed to 4.9.202

19/12/2019

DRM protected content will no longer crash the device (YouTube, Spotify, Netflix, etc)

Fingerprint scanner now works properly

18/12/2019

GPS is now able to get a more accurate location

Sensors work (gyro, light sensor, etc)

Fixed issue with Gapps causes bootloop after installing an update

16/12/2019

First Build

Telegram Group:

[Exynos9810][LineageOS 17.0][UNOFFICIAL]

Paypal:

abtekk

Contributors:

[MENTION=6022102]CodeFox[/MENTION], [MENTION=6371894]jesec[/MENTION], [MENTION=4032833]farovitus[/MENTION], [MENTION=8317594]Vaughnn[/MENTION], [MENTION=9116297]Eamo5[/MENTION] + many others that i cant remember, commit history is on my github.

Source Code: https://github.com/LineageOS/

Kernel: https://github.com/evilexecutable/android_kernel_samsung_universal9810-star/tree/lineage-17.0

ROM OS Version: 10 (Q)

ROM Kernel: Linux 4.9.185

Version Information

Status: Alpha

Last Updated: 16-12-2019

XDA:DevDB Information

Lineage-17.1, ROM for the Samsung Galaxy S9

Contributors

abtekk, synt4x.93

Source Code: https://github.com/evilexecutable/android_kernel_samsung_universal9810-star/tree/lineage-17.0

ROM OS Version: Android 10

ROM Kernel: Linux 4.x

Version Information

Status: Alpha

Beta Release Date: 2019-12-16

Created 2019-12-17

Last Updated 2020-01-29