> This did not work, as you can see. Well I don't see anything in the logs for -17 above wrong. You can try to turn up the debugging like this on your kernel command line:
drm.debug=0x106 log_buf_len=4M Then capture and share the journal again and we'll see if anything else jumps out. Note: This will be really verbose and a lot bigger. If you want to trim it; we only need the logs up until the point that the issue reproduced. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-firmware in Ubuntu. https://bugs.launchpad.net/bugs/2128883 Title: linux-firmware 20240318.git3b128b60-0ubuntu2.19 causes black screen on login with dual 4K monitors at 200% scaling on Wayland (AMD GPU) Status in linux-firmware package in Ubuntu: Confirmed Status in mutter package in Ubuntu: New Bug description: Summary: After automatic update from linux-firmware version .17 to .19 on October 17, 2025, Ubuntu 24.04 displays black screen on login when using dual LG ULTRAFINE 4K monitors with 200% fractional scaling on Wayland. The issue specifically occurs when GNOME/GDM attempts to initialize displays at 200% scaling during boot. Hardware: - CPU: AMD Ryzen 16-core - GPU: AMD (integrated graphics) - Monitors: 2x LG ULTRAFINE 4K (3840x2160) via DisplayPort - Display Server: Wayland - Desktop: GNOME Steps to Reproduce: 1. Have dual 4K monitors configured at 200% fractional scaling 2. Update linux-firmware from .17 to .19 3. Save display configuration at 200% scaling 4. Reboot 5. Attempt to login Expected Result: Desktop should load normally with both monitors displaying correctly at 200% scaling Actual Result: Black screen after login when monitors.xml contains 200% scaling configuration Key Diagnostic Findings: - Deleting ~/.config/monitors.xml allows login at 100% default scaling - Changing to 200% scaling AFTER login works perfectly - Problem only occurs when GDM/GNOME loads 200% scaling during boot initialization - Rebooting after setting 200% recreates the black screen issue - This is a boot-time initialization bug, not a runtime scaling bug Workaround: Deleting ~/.config/monitors.xml before each login allows access, but requires manual reconfiguration to 200% each session (unsustainable for daily use) Fix: Downgrading to linux-firmware=20240318.git3b128b60-0ubuntu2.17 resolves the issue completely. All scaling levels work correctly with firmware .17. Additional Information: - Wayland is required for this hardware setup (X11 has display issues with dual 4K monitors even on firmware .17) - Single monitor configuration was not tested - Issue appeared immediately after firmware update on Oct 17, 2025 - Firmware .17 works perfectly with Wayland + dual 4K + 200% scaling at all times (boot and runtime) - Bug is specific to boot-time display initialization with 200% fractional scaling in firmware .19 System Information: - Ubuntu Version: 24.04.3 LTS - linux-firmware installed: 20240318.git3b128b60-0ubuntu2.17 (working - currently held) - linux-firmware candidate: 20240318.git3b128b60-0ubuntu2.19 (broken - causes black screen) ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: linux-firmware 20240318.git3b128b60-0ubuntu2.17 ProcVersionSignature: Ubuntu 6.14.0-33.33~24.04.1-generic 6.14.11 Uname: Linux 6.14.0-33-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: joe 2802 F.... wireplumber /dev/snd/controlC0: joe 2802 F.... wireplumber /dev/snd/seq: joe 2797 F.... pipewire CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sat Oct 18 10:25:24 2025 Dependencies: firmware-sof-signed 2023.12.1-1ubuntu1.10 InstallationDate: Installed on 2025-10-15 (3 days ago) InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1) MachineType: ASUS System Product Name ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.14.0-33-generic root=UUID=50126da2-dd87-4955-8708-1ecb4482ba78 ro quiet splash RelatedPackageVersions: linux-restricted-modules-6.14.0-33-generic N/A linux-backports-modules-6.14.0-33-generic N/A linux-firmware 20240318.git3b128b60-0ubuntu2.17 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux-firmware UpgradeStatus: No upgrade log present (probably fresh install) acpidump: Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 126: Error executing command as another user: Request dismissed dmi.bios.date: 07/14/2025 dmi.bios.release: 10.78 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 1078 dmi.board.asset.tag: Default string dmi.board.name: ROG STRIX B850-A GAMING WIFI dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1078:bd07/14/2025:br10.78:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB850-AGAMINGWIFI:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2128883/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
