linux-kernel - Re: [PATCH v2] PM: add kernel parameter to disable asynchronous suspend/resume

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Message-ID: <18c12f92-2194-4244-8793-5d916edfd4e8@infradead.org>
Date: Tue, 8 Jul 2025 08:36:14 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, Jonathan Corbet
 <corbet@....net>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Pavel Machek <pavel@...nel.org>, Len Brown <len.brown@...el.com>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pm@...r.kernel.org, peter.griffin@...aro.org,
 andre.draszik@...aro.org, willmcvicker@...gle.com, kernel-team@...roid.com
Subject: Re: [PATCH v2] PM: add kernel parameter to disable asynchronous
 suspend/resume

Hi,

On 7/8/25 8:16 AM, Tudor Ambarus wrote:

> ---
>  Documentation/admin-guide/kernel-parameters.txt | 11 +++++++++++
>  kernel/power/main.c                             |  9 +++++++++
>  2 files changed, 20 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index f1f2c0874da9ddfc95058c464fdf5dabaf0de713..33ca6b881b1d77bdeea765b19291a90b2a82e8a3 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -5000,6 +5000,17 @@
>  			that number, otherwise (e.g., 'pmu_override=on'), MMCR1
>  			remains 0.
>  

This should be more like:

	pm_async=off	[PM]

or

> +	pm_async	[PM]

	pm_async=	[PM]
			Format: off

> +			If set to "off", disables asynchronous suspend and
> +			resume of devices during system-wide power transitions.
> +			This parameter sets the initial value of the
> +			/sys/power/pm_async sysfs knob at boot time.
> +			This can be useful on platforms where device
> +			dependencies are not well-defined, or for debugging
> +			power management issues. Defaults to "on" (asynchronous
> +			operations enabled).
> +
> +
>  	pm_debug_messages	[SUSPEND,KNL]
>  			Enable suspend/resume debug messages during boot up.

-- 
~Randy