[Bug 2161930] Re: LG Monitor shows black screen when set to 144hz

[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2161930 Title: LG Monitor shows black screen when set to 144hz Status in linux package in Ubuntu: Expired Bug description: ### Issue I have a PC connected to an LG 27GL850-B Ultragear QHD monitor. When I launch Ubuntu, the LG screen displays a black screen by default. If I change the refresh rate from 144hz to 120hz the monitor will work correctly. ### Expected behavior The monitor should be configured to display correctly by default. ### System Info * OS: Ubuntu 26.04 LTS * Hardware Model: ASUS TUF GAMING B550M-PLUS _WI-FI_ * Processor: AMD Ryzen™ 5 5600X × 12 * Graphics: zink Vulkan 1.4(NVIDIA GeForce RTX™ 4070 SUPER (NVK AD104)) * Firmware Version: 3621 * Kernel Version: Linux 7.0.0-14-generic ### XOrg version xorg: Installed: (none) Candidate: 1:7.7+26ubuntu1 Version table: 1:7.7+26ubuntu1 500 500 http://archive.ubuntu.com/ubuntu resolute/universe amd64 Packages ### Extra info * I am booting Ubuntu off an unmodified USB image in "Try Ubuntu" mode * I have two monitors connected. The 144hz LG connected via DisplayPort and a 60hz Dell connected via HDMI * The same issue occurred when booting my PC on Linux Mint ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: xorg (not installed) ProcVersionSignature: Ubuntu 7.0.0-14.14-generic 7.0.0 Uname: Linux 7.0.0-14-generic x86_64 NonfreeKernelModules: zfs ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: pass CasperVersion: 26.04.2 CloudArchitecture: x86_64 CloudID: nocloud CloudName: unknown CloudPlatform: nocloud CloudSubPlatform: seed-dir (/var/lib/cloud/seed/nocloud) CurrentDesktop: ubuntu:GNOME Date: Mon Jul 27 22:34:47 2026 LiveMediaBuild: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) ProcEnviron: LANG=C.UTF-8 PATH=(custom, no user) SHELL=/bin/bash XDG_RUNTIME_DIR=<set> SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161930/+subscriptions