[off topic - RFC] APM suspend + hdparam

[off topic - RFC] APM suspend + hdparam

[Soewono Effendi]

Hello there, 
 
I've been playing around with hdparam. 
 
With one of these parameter, one can enjoy the __silence__ stolen by his/her  
beloved computer :( 
 -y   put IDE drive in standby mode 
 -Y   put IDE drive to sleep 
e.g. 
hdparm -Y /dev/hda  
(assume you have only one hard disk, and your linux is there) 
 
But... 
As soon as the kernel accesses the hard disk (bflush? kswapd? etc.), gone is  
the __silence__ :( 
 
So I tried this: 
apm -s & hdparm -Y /dev/hda & 
 
sometime it works, sometime not. I know that "software suspend" is on the  
way, but till denn, this might be easier to "fix". 
 
 
Idea: 
        One can __FREEZE__ the kernel, put IDE drive to sleep and then __sus 
pend__ the system, just like "apm -s" does. 
        If the system wakes up again, waits till IDE is waken up (or maybe le 
ts the kernel wakes it up), and just continue to work as normal, stealin 
g your __silence__ again. 
 
Requirement: 
        APM must work ;).  
        ACPI never tested before. 
 
Purpose: 
        To have ONE BIG BUTTON(TM) that give you a break!  
        and just like magic, on an instant your are back on work again!  
        If you lose your power during this suspend,  
        then may the penguin be with you ;) 
 
I would like to call this feature HOT SUSPEND(TM) :) 
 
Best regards, 
Soewono Effendi 
 
 
DISCLAIMER: 
        I take no responsibilities in any case of data and/or hardware lost 
        if you try these experiments :) 
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SEffendi(a)web.de 
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Re: [off topic - RFC] APM suspend + hdparam

[Russell King]

On Mon, Jun 17, 2002 at 10:24:03AM +0200, Soewono Effendi wrote:
> So I tried this: 
> apm -s & hdparm -Y /dev/hda & 

If your APM BIOS doesn't spin down the disks when entering standby/suspend,
your APM BIOS implementation is broken (or if its a desktop machine, maybe
you didn't configure the APM BIOS settings correctly?)

You might try: hdparm -S 12 /dev/hda && apm -s; hdparm -S 0 /dev/hda

This should put a 1 minute inactivity timeout on the drive, then suspend
the machine.  1 minute later, the drive should spin down.  When you resume,
the following hdparm will turn off the inactivity timeout.

> I would like to call this feature HOT SUSPEND(TM) :) 

No coding required.  No extra commands required with a non-broken APM bios.

-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html