linux-kernel - Re: [PATCH] Optional Beeping During Resume From Suspend To Ram.

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Date:	Thu, 5 Jul 2007 08:34:17 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] Optional Beeping During Resume From Suspend To Ram.

Hi.

On Thursday 05 July 2007 07:29:07 Pavel Machek wrote:
> Here's the version that uses just one variable, relative to Nigel's
> patch. Hmm, and it also closes nasty trap for the user in
> acpi_sleep_setup; order of parameters actually mattered there,
> acpi_sleep=s3_bios,s3_mode doing something different from
> acpi_sleep=s3_mode,s3_bios .  It actually works here.

Good catch.

> Will you fold it into  patch28, or should I create a changelog?
> Testing welcome :-).

I really dislike the overloading of acpi video flags in this way. You yourself 
have said in the past that new functionality should use /sys instead 
of /proc, and here you are overloading an existing variable for the sake of 
expediency. Please, stick with a new /sys/power entry.

Documentation is also an issue. Your patch should update the kernel_parameters 
file so users can know how to get the beeping to happen. It would be nice if 
it mentioned the proc entry too.

[...]

> @@ -80,9 +82,11 @@ static int __init acpi_sleep_setup(char 
>  
>  __setup("acpi_sleep=", acpi_sleep_setup);
>  
> +/* Ouch, we want to delete this. We already have better version in 
userspace, in 
> +   s2ram from suspend.sf.net project */

Do we? This version has advantages in not requiring any userspace app and in 
being able to work even if you can't yet get as far as having userspace 
working. [Reads more] Oh, do you mean a better way of setting this parameter 
(ie requiring the userspace app and then having it echo $VALUE 
> /proc/sys/kernel/acpi_video_flags? Considering we're not going to suspend 
to ram during init scripts, we have a way of setting/resetting it post-boot 
with or without s2m and the flag doesn't therefore need to be command line 
option, I can go with that. Does it need a patch to mark it as deprecated?

[...]

> @@ -124,7 +124,7 @@ real_save_cr3:	.long 0
>  real_save_cr4:	.long 0
>  real_magic:	.long 0
>  video_mode:	.long 0
> -video_flags:	.long 0
> +realmode_flags:	.long 0
>  beep_flags:	.long 0
>  real_efer_save_restore:	.long 0
>  real_save_efer_edx: 	.long 0

Beep_flags should be removed too if you're sticking with /proc.

Regards,

Nigel
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