[Bug 2171818] Re: amdgpu reports incomplete modes list for screen attached via USB-C

** Tags added: kernel-daily-bug -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2171818 Title: amdgpu reports incomplete modes list for screen attached via USB-C Status in linux package in Ubuntu: New Bug description: I have a laptop (with two AMD GPUs) that I often connect to a 4k DELL monitor using an USB-C cable. Sometimes amdgpu seems to set an incomplete list of supported modes for this monitor when I first connect it, so Gnome cannot use its stored configuration for it. This is clearly seen in the logs: gnome-shell[5629]: Failed to use stored monitor configuration: Invalid mode 3840x2160 (120,000) for monitor 'DEL DELL S2725QC' This might be a race condition, because the problem doesn't always happen. The logs in this report show the problem happening as the laptop wakes up from sleep (at 00:05) with the monitor connected. (But waking up from sleep is not required, I often see this problem when I connect the monitor to an already awake laptop.) Then at 00:12 I disconnected and reconnected the monitor, and this second time it got all of its modes properly enumerated. I never managed to reproduce the problem by repeatedly disconnecting and reconnecting the monitor, I've only ever experienced it on the first time it gets connected (per reboot). I've attached to this report: - /sys/class/drm/card*-*/status and modes for both the incorrect and correct states - system and user journalct output - ~/.config/monitors.xml - version info on relevant components ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-38-generic 7.0.0-38.38 ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14 Uname: Linux 7.0.0-38-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: dszoboszlay 5088 F.... wireplumber /dev/snd/controlC1: dszoboszlay 5088 F.... wireplumber /dev/snd/controlC0: dszoboszlay 5088 F.... wireplumber /dev/snd/seq: dszoboszlay 5082 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Thu Oct 22 00:19:57 2026 InstallationDate: Installed on 2024-12-25 (665 days ago) InstallationMedia: Ubuntu 24.10 "Oracular Oriole" - Release amd64 (20241009.4) MachineType: ASUSTeK COMPUTER INC. ROG Zephyrus G14 GA402RK_GA402RK ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-38-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-05-24 (151 days ago) dmi.bios.date: 07/01/2022 dmi.bios.release: 5.24 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: GA402RK.313 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: GA402RK dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: gametopia dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.ec.firmware.release: 3.12 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrGA402RK.313:bd07/01/2022:br5.24:efr3.12:svnASUSTeKCOMPUTERINC.:pnROGZephyrusG14GA402RK_GA402RK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnGA402RK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaROGZephyrusG14: dmi.product.family: ROG Zephyrus G14 dmi.product.name: ROG Zephyrus G14 GA402RK_GA402RK dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2171818/+subscriptions