Re: [BUG] AMD PMC causes system hang on suspend (HP EliteBook X G1a, Strix Point)

[Mario Limonciello <mario.limonciello@amd.com>]

On 12/3/25 11:28 AM, CX MAIL wrote:
> Hello,
> 
> I'm reporting a critical suspend issue on HP EliteBook X G1a with AMD Ryzen
> AI 9 HX 375 (Strix Point). The system completely hangs when entering s2idle
> with the AMD PMC driver loaded.
> 
> Hardware:
> - Model: HP EliteBook X G1a 14 inch (Model 8D08)
> - CPU: AMD Ryzen AI 9 HX 375 (Strix Point)
> - GPU: Radeon 890M (integrated)
> - BIOS: X88 Ver. 01.03.11 (2025-09-03)
> 
> Kernel: 6.17.7-ba19.fc43.x86_64 (Fedora-based)
> Current cmdline: bluetooth.disable_ertm=1 amdgpu.gpu_recovery=1 pcie_aspm=off
> 
> Problem:
> When executing "systemctl suspend", the system enters s2idle but immediately
> hangs. The last kernel message is "PM: suspend entry (s2idle)" with no
> further output. System becomes completely unresponsive - keyboard, touchpad,
> and power button (short press) have no effect. Only hard power-off works.
> 
> BIOS configuration:
> - APMF enabled
> - Modern Standby (s2idle only, S3 not supported by firmware)
> - /sys/power/mem_sleep: [s2idle]
> 
> AMD PMC device present: /sys/bus/platform/devices/AMDI000A:00/
> 
> Workaround:
> Adding "initcall_blacklist=amd_pmc_driver_init" to kernel cmdline prevents
> the AMD PMC driver from loading. With this workaround, s2idle works perfectly
> and the system resumes normally from suspend.
> 
> Verification with workaround:
> - lsmod | grep amd_pmc: (no output - driver not loaded)
> - Suspend/resume cycle: successful
> 
> Logs attached:
> 1. system-info.txt - detailed system information
> 2. suspend-fail.log - Journal from failed suspend attempt (hangs after
>     "PM: suspend entry")
> 3. suspend-success.log - Journal from successful suspend/resume with
>     workaround applied
> 
> The failure log shows the system stops all output immediately after entering
> s2idle, suggesting the AMD PMC driver causes a hard hang during early
> platform suspend initialization.
> 
> Please let me know if you need any additional debug information or would like
> me to test patches.
> 
> Best regards,
> CX

Hi,

Please use amd-s2idle from https://pypi.org/project/amd-debug-tools/ to 
generate a report.  It may root cause it for you. If it doesn't, please 
attach it to a bugzilla or drm/freedesktop bug report and CC me.

Thanks,