Public bug reported:
After updating to kernel 7.3.0-10-generic, both HDMI monitors connected
through my USB-C dock stopped receiving video. Booting the previous
kernel, 7.3.0-9-generic, restored the displays using the same laptop,
dock, cables, monitors, and USB port.
Environment:
Kubuntu 26.10, KDE Plasma 6.7.5, Wayland.
Framework Laptop 13, AMD Ryzen 7040 Series.
AMD Phoenix1 graphics using amdgpu.
Dock connected to a rear USB4-capable port.
Ultrawide monitor: HDMI output 1, 3440×1440 at approximately 60 Hz.
Smaller monitor: HDMI output 3, 1920×1080 at 60 Hz.
Steps to reproduce:
Boot kernel 7.3.0-10-generic.
Connect the dock with both HDMI monitors attached.
Wait for the saved display configuration to apply.
Expected:
Both external monitors display a picture, as they do with kernel
7.3.0-9-generic.
Actual:
Both monitors are detected and reported as enabled, but neither receives video.
The ultrawide wakes and eventually reports “No signal”; the smaller monitor
remains asleep. My saved configuration disables the laptop panel when docked,
initially leaving all screens blank. Manually enabling the laptop panel
restores the laptop display but does not restore external video.
Troubleshooting:
Tested each external monitor individually at 1920×1080, 60 Hz: neither
displayed video.
Fully power-cycled the dock: no improvement.
Booted the previous kernel, 7.3.0-9-generic: external video returned.
Restored both external monitors and my desired screen configuration
successfully.
The failing boot logged:
Failed to get ACT after 3000 ms, last status: 00
Link(3) training attempt 10 of 10 failed
enabling link 3 failed: 15
Failure: unknown encoding format
Working kernel: 7.3.0-9-generic, package version 7.3.0-9.9.
Failing kernel: 7.3.0-10-generic, package version 7.3.0-10.10.
The attached file contains the investigation report, graphics logs from
both boots, package versions, and the working display configuration. The
system is currently running the working kernel, so diagnostics collected
now will identify 7.3.0-9 rather than the failing kernel.
ProblemType: Bug
DistroRelease: Ubuntu 26.10
Package: linux-image-7.3.0-9-generic 7.3.0-9.9
ProcVersionSignature: Ubuntu 7.3.0-9.9-generic 7.3.0-rc6
Uname: Linux 7.3.0-9-generic x86_64
ApportVersion: 2.36.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Fri Oct 30 09:51:13 2026
InstallationDate: Installed on 2026-10-22 (8 days ago)
InstallationMedia: Kubuntu 26.10 "Stonking Stingray" - Official amd64 (20261013)
MachineType: Framework Laptop 13 (AMD Ryzen 7040Series)
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.3.0-9-generic
root=UUID=451bbf1d-4ae0-4719-96e9-511b35316a2e ro quiet splash
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/23/2026
dmi.bios.release: 3.20
dmi.bios.vendor: INSYDE Corp.
dmi.bios.version: 03.20
dmi.board.asset.tag: *
dmi.board.name: FRANMDCP05
dmi.board.vendor: Framework
dmi.board.version: A5
dmi.chassis.asset.tag: FRANDGCPA54381001A
dmi.chassis.type: 10
dmi.chassis.vendor: Framework
dmi.chassis.version: A5
dmi.modalias:
dmi:bvnINSYDECorp.:bvr03.20:bd06/23/2026:br3.20:svnFramework:pnLaptop13(AMDRyzen7040Series):pvrA5:rvnFramework:rnFRANMDCP05:rvrA5:cvnFramework:ct10:cvrA5:skuFRANDGCP05:pfaLaptop:
dmi.product.family: Laptop
dmi.product.name: Laptop 13 (AMD Ryzen 7040Series)
dmi.product.sku: FRANDGCP05
dmi.product.version: A5
dmi.sys.vendor: Framework
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug stonking wayland-session
** Attachment added: "Dock display bug report - complete_1.txt"
https://bugs.launchpad.net/bugs/2172604/+attachment/6013760/+files/Dock%20display%20bug%20report%20-%20complete_1.txt
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https://bugs.launchpad.net/bugs/2172604
Title:
Regression: USB-C dock HDMI displays fail on Framework AMD laptop with
kernel 7.3.0-10; work on 7.3.0-9
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