Public bug reported:
While the system was idle and fully awake (not ACPI S3/suspend), the
kernel put the unused ASMedia ASM4242 PCIe switch into D3cold. Resume
failed and runtime PM then wedged the machine. The reset button was
required.
Hardware:
- Ubuntu 26.04.1 LTS (resolute), kernel 7.0.0-42-generic #42-Ubuntu
- AMD Ryzen 7 9700X (Granite Ridge), Gigabyte board
- ASM4242 upstream port 0000:10:00.0 [1b21:2421], behind AMD root port
0000:00:02.2
- ASM4242 USB 3.2 xHCI 0000:72:00.0 [1b21:2426]
- ASM4242 USB4/Thunderbolt router 0000:73:00.0 [1b21:2425]
- No device was plugged into the ASM4242 ports
- iGPU amdgpu 0000:74:00.0 [1002:13c0] is the display GPU
- /sys/module/pcie_port_pm is enabled; d3cold_allowed is 1 on 0000:10:00.0
Timeline (CET), previous boot 2026-11-05 07:35:11 through 23:05:00:
- 23:00 sysstat-collect ran. No suspend.target and no "PM: suspend entry".
- 23:02:48 workqueue: amdgpu_device_delay_enable_gfx_off hogged CPU
- 23:02:53 pcieport 0000:10:00.0: Unable to change power state from D3cold to
D0, device inaccessible
- 23:02:58 onward: amdgpu 0000:74:00.0 fence fallback timer expired on
gfx_0.1.0, then gfx_0.0.0 and sdma0
- pci_pme_list_scan hogged CPU repeatedly (4, then 35 times)
- 23:04:54 at least six kworkers blocked for more than 122 seconds in workqueue
"pm", pm_runtime_work -> rpm_resume, with rpm_resume nested inside rpm_resume
- Journal stops at 23:05:00. Next boot 2026-11-06 03:49:45 reports: x86/amd:
Previous system reset reason [0x00010800]: system reset pin BP_SYS_RST_L was
tripped
Expected: an idle ASM4242 either stays in D0, or a failed D3cold resume is
abandoned without blocking other runtime-PM workers.
Actual: the bridge did not become accessible and the runtime-PM workqueue
deadlocked. The desktop froze. amdgpu fence timeouts followed the stall.
This matches Debian bug #1102175 (ASM4242 1b21:2421 upstream port stuck
in D3cold on AMD Raphael/Granite Ridge, forwarded to linux-pci). It
still happens on Ubuntu 7.0.0-42.
Please quirk this device so the ASM4242 upstream port is not allowed to
enter D3cold, and make a failed D3cold resume return instead of nesting
forever in rpm_resume. A global pcie_port_pm=off workaround is broader
than this device.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-42-generic 7.0.0-42.42
ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14
Uname: Linux 7.0.0-42-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 6 04:10:17 2026
InstallationDate: Installed on 2025-07-15 (478 days ago)
InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215)
IwDevWlp8s0Link: Not connected.
MachineType: Gigabyte Technology Co., Ltd. X870 EAGLE WIFI7
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-42-generic
root=UUID=3bf29348-db41-415d-af2b-281509a0a57e 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 2026-10-04 (32 days ago)
dmi.bios.date: 05/21/2026
dmi.bios.release: 5.41
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: F12
dmi.board.asset.tag: Default string
dmi.board.name: X870 EAGLE WIFI7
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
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.:bvrF12:bd05/21/2026:br5.41:svnGigabyteTechnologyCo.,Ltd.:pnX870EAGLEWIFI7:pvrDefaultstring-ADO:rvnGigabyteTechnologyCo.,Ltd.:rnX870EAGLEWIFI7:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring:pfaX870MB:
dmi.product.family: X870 MB
dmi.product.name: X870 EAGLE WIFI7
dmi.product.sku: Default string
dmi.product.version: Default string-ADO
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "asm4242-d3cold-hang.txt"
https://bugs.launchpad.net/bugs/2173496/+attachment/6015287/+files/asm4242-d3cold-hang.txt
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https://bugs.launchpad.net/bugs/2173496
Title:
ASM4242 (1b21:2421) fails to leave D3cold and deadlocks runtime PM on
AMD Granite Ridge
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