Hi, for Linux's kernel from git: I think AMD_PMC should select/depend-on CONFIG_SUSPEND, while it calls acpi_register_lps0_dev ./drivers/platform/x86/amd-pmc.c: err = acpi_register_lps0_dev(&amd_pmc_s2idle_dev_ops); and acpi_register_lps0_dev definition is surrounded by #ifdef CONFIG_SUSPEND -- Robert Święcki