I would like to mention that I think this is the same bug I have hit.
I am using Debian Stable but BACKPORTS kernels on a new-ish (Dec 2025) :
Thinkpad P14s Gen6 AMD
I pass the kernel boot parameter :
amdgpu.dcdebugmask=0x10
to fix some X/screen issues (slow redraw, lock-ups).
Suspend works when I close the laptop lid.
However, updating to the last backport kernel "6.18.15+deb13" caused
suspend to break. The laptop seems to suspend on lid close (red lid
light starts flashing normally) but in the morning the laptop is warm
and the battery has drained.
To summarise :
6.18.12+deb13-amd64 -- ok
6.18.15+deb13-amd64 -- BAD suspend
I installed the latest "testing" kernel "6.19.6+deb14+1" and suspend
works OK again.
6.19.6+deb14+1-amd64 - ok
In case it is useful, I attach the output of lspci.
Cheers,
--
Alastair Sherringham
blog : https://www.sherringham.net/blog
art: https://art.sherringham.net
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo Root
Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo IOMMU
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo Dummy
Host Bridge
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo PCIe
USB4 Bridge
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo PCIe
USB4 Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo Dummy
Host Bridge
00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo GPP
Bridge
00:02.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo GPP
Bridge
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo GPP
Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo Dummy
Host Bridge
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo Dummy
Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo
Internal GPP Bridge to Bus [C:A]
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo
Internal GPP Bridge to Bus [C:A]
00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Strix/Strix Halo
Internal GPP Bridge to Bus [C:A]
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 71)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Strix Data Fabric;
Function 7
c1:00.0 Non-Volatile memory controller: SK hynix Platinum P41/PC801 NVMe Solid
State Drive
c2:00.0 Network controller: MEDIATEK Corp. Device 7925
c3:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller (rev 0e)
c4:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Strix
[Radeon 880M / 890M] (rev d1)
c4:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Radeon High
Definition Audio Controller [Rembrandt/Strix]
c4:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD]
Strix/Krackan/Strix Halo CCP/ASP
c4:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 151e
c4:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] Audio
Coprocessor (rev 70)
c4:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h/1ah HD
Audio Controller
c5:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc.
[AMD] Strix/Strix Halo PCIe Dummy Function
c5:00.1 Signal processing controller: Advanced Micro Devices, Inc. [AMD]
Strix/Krackan/Strix Halo Neural Processing Unit (rev 10)
c6:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 151f
c6:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 151a
c6:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 151b
c6:00.5 USB controller: Advanced Micro Devices, Inc. [AMD] USB4 Router 0
c6:00.6 USB controller: Advanced Micro Devices, Inc. [AMD] USB4 Router 1
