Public bug reported:
On shutdown, the RX 7900 XTX fans spin up and continue running while the
system is in S5 (soft-off). The rest of the machine powers down
correctly, confirmed by the fact that switching off the PSU stops the
fans, so this is standby-rail behaviour, not a shutdown hang.
Regression, bisected between Ubuntu kernel builds:
7.0.0-27-generic — GOOD (fans stop on poweroff)
7.0.0-28-generic — BAD (fans spin in S5)
Reproducible both directions, multiple cycles each.
Hardware: Ryzen 7 7600X, ASRock B850I Lightning WiFi. Two amdgpu-bound
devices present: RX 7900 XTX (03:00.0, DCN 3.2) as the discrete/display
GPU, plus the Raphael iGPU (0b:00.0, DCN 3.1.5), which amdgpu still
fully initialises. Poweroff teardown covers both.
Not yet tested on mainline; willing to test a mainline kernel to confirm
whether this is an Ubuntu-delta regression or upstream, if a triager
wants that.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sun Jul 26 18:11:16 2026
InstallationDate: Installed on 2025-11-07 (261 days ago)
InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
IwDevWlp7s0Link: Not connected.
MachineType: ASRock B850I Lightning WiFi
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=b80b57ad-ad0b-4866-844f-72c840a6557d ro quiet splash maxcpus=12
smt=on nvme_core.io_timeout=4
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-02-15 (161 days ago)
dmi.bios.date: 12/11/2025
dmi.bios.release: 5.40
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 4.03
dmi.board.asset.tag: Default string
dmi.board.name: B850I Lightning WiFi
dmi.board.vendor: ASRock
dmi.board.version: Default string
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr4.03:bd12/11/2025:br5.40:svnASRock:pnB850ILightningWiFi:pvrDefaultstring:rvnASRock:rnB850ILightningWiFi:rvrDefaultstring:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaDefaultstring:
dmi.product.family: Default string
dmi.product.name: B850I Lightning WiFi
dmi.product.sku: Default string
dmi.product.version: Default string
dmi.sys.vendor: ASRock
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161821
Title:
amdgpu: RX 7900 XTX fans spin up on poweroff regression in 7.0.0-28,
7.0.0-27 good
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