APM, ACPI and DPMS question

APM, ACPI and DPMS question

[Jan Bernatik]

Hi,

I'm studying ACPI, and I found that:

----------------------------------------------------------------------
You should also be aware of another little glitch I discovered. The 
XFree86 server has an option for DPMS (Energy Star) features. The DPMS 
can states can be one of standby, suspend, off or on. Since the 2.4.x 
kernels cannot suspend to disk, this can cause problems.
----------------------------------------------------------------------
source: http://www.tldp.org/HOWTO/ACPI-HOWTO/daemons.html

I really doesn't understand this. I thought it's just about monitor 
energy, so please could somebody just roughly explain this ?

thanks, have a nice day

Jan Bernatik
-- 
student VUT BRNO - FEEC / Czech Republic
http://www.feec.vutbr.cz

registered user no. 207163 using Debian
icq: 78209478
home: linuxdesktop.kn.vutbr.cz


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Re: APM, ACPI and DPMS question

[Ow Mun Heng]

On Tue, 2004-09-14 at 20:52, Jan Bernatik wrote:
> Hi,
> 
> I'm studying ACPI, and I found that:
> 
> ----------------------------------------------------------------------
> You should also be aware of another little glitch I discovered. The 
> XFree86 server has an option for DPMS (Energy Star) features. The DPMS 
> can states can be one of standby, suspend, off or on. Since the 2.4.x 
> kernels cannot suspend to disk, this can cause problems.
> ----------------------------------------------------------------------

I may be mistaken but.. I think I managed to get a 2.4 kernel on RH9
days to suspend to disk properly.

DPMS also works. Perhaps someone else can remember it much better.
> source: http://www.tldp.org/HOWTO/ACPI-HOWTO/daemons.html
> 
> I really doesn't understand this. I thought it's just about monitor 
> energy, so please could somebody just roughly explain this ?
> 
> thanks, have a nice day
> 
> Jan Bernatik

-- 
Ow Mun Heng
Fedora GNU/Linux Core 2 on D600 1.4Ghz CPU kernel
2.6.7-2.jul1-interactive 
Neuromancer 09:50:41 up 1 day, 34 min, 7 users, load average: 1.83,
1.21, 1.19 


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Re: APM, ACPI and DPMS question

[Nigel Cunningham]

Hi.

On Tue, 2004-09-14 at 22:52, Jan Bernatik wrote:
> ----------------------------------------------------------------------
> You should also be aware of another little glitch I discovered. The 
> XFree86 server has an option for DPMS (Energy Star) features. The DPMS 
> can states can be one of standby, suspend, off or on. Since the 2.4.x 
> kernels cannot suspend to disk, this can cause problems.

Suspend2 is available for 2.4 kernels; it doesn't need ACPI or APM
support. You're right in thinking that the issues of whether
suspend-to-{ram,disk} is supported is completely independent of DPMS. It
appears that the author of that page was confused.

Regards,

Nigel
-- 
Nigel Cunningham
Pastoral Worker
Christian Reformed Church of Tuggeranong
PO Box 1004, Tuggeranong, ACT 2901

Many today claim to be tolerant. True tolerance, however, can cope with others
being intolerant.



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Re: APM, ACPI and DPMS question

[Stefan Seyfried]

On Tue, Sep 14, 2004 at 02:52:16PM +0200, Jan Bernatik wrote:
> Hi,
> 
> I'm studying ACPI, and I found that:
> 
> ----------------------------------------------------------------------
> You should also be aware of another little glitch I discovered. The 
> XFree86 server has an option for DPMS (Energy Star) features. The DPMS 
> can states can be one of standby, suspend, off or on. Since the 2.4.x 
> kernels cannot suspend to disk, this can cause problems.

suspend to disk has nothing to do with DPMS at all. 
> ----------------------------------------------------------------------
> source: http://www.tldp.org/HOWTO/ACPI-HOWTO/daemons.html

well, this document is simply plain wrong in this regard.
 
> I really doesn't understand this. I thought it's just about monitor 
> energy, so please could somebody just roughly explain this ?

DPMS is monitor "standby", "suspend" and "off". It has nothing to do with
system power management, ACPI, APM or suspend to disk / RAM.

Maybe you shold write the author of the ACPI-HOWTO and tell him.
-- 
Stefan Seyfried



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