Support for "standby" in ACPI4Linux

Support for "standby" in ACPI4Linux

[Spam Guard]

Hi,

I'm have a Thinkpad T42, and on it I'm running a kernel compiled from 
the Debian "linux-source-2.6.14" package, which is basically the latest 
2.6.14.2 kernel with Debian some patches (security, stability, etc.).  
As I understand it, a pretty recent ACPI4Linux version should be 
included in this kernel by default.  Also, I've patched this kernel with 
Suspend2 (www.suspend2.net), in case that's of consequence. 

ACPI "sleeping" to memory works pretty well on my computer, but I was 
wondering about the "standby" mode.  My /sys/power/state reports that 
it's capable of both "mem" and "standby," but "mem" is the only option 
that seems to work.  With "standby" all I get is a message that reads 
"acpi_pm_prepare does not support 1" on virtual terminal 63. 

Is there still enough demand to continue development of this feature, or 
has it kind of fallen off the map because users get enough functionality 
out of sleeping to memory?  Or should standby be functioning now?  Is 
there possibly something wrong with my configuration?

Thanks for your help,
Sukant Hajra



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Re: Support for "standby" in ACPI4Linux

[Luca Capello]

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Hello!

On Thu 17 Nov 2005 07:10 +0100, Spam Guard wrote:
> I'm have a Thinkpad T42, and on it I'm running a kernel compiled
[...]
> Suspend2 (www.suspend2.net), in case that's of consequence. 

I've a T42p with Debian unstable, vanilla kernels 2.6.13, 2.6.14 and
2.6.15-rc1, compiled with the Debian-way (make-kpkg).

> ACPI "sleeping" to memory works pretty well on my computer, but I
> was wondering about the "standby" mode.  My /sys/power/state reports
> that it's capable of both "mem" and "standby,"

AFAIK, S1 (aka standby) is not supported on the T42p:
=====
luca@gismo:~$ grep S3 /var/log/syslog
Nov 17 08:44:46 gismo kernel: ACPI: (supports S0 S3 S4 S5)
Nov 17 09:02:47 gismo kernel: ACPI: (supports S0 S3 S4 S5)
luca@gismo:~$ 
=====

But strangely:
=====
luca@gismo:~$ cat /sys/power/state 
standby mem disk 
luca@gismo:~$ 
=====

IIRC this is a bug in the sleep state showing function.

> but "mem" is the only option that seems to work.  With "standby" all
> I get is a message that reads "acpi_pm_prepare does not support 1"
> on virtual terminal 63.

I use S3 (suspend-to-ram) and S4 (suspend-to-disk) without any problem
since 2.6.12 (or before, I don't remember), directly from X.org with
the FLOSS radeon driver (and with all the driver but the modem
installed, included the ipw2100).  And the machine survives to multiple
sleep cycles :-D

I've never tried suspend2, because the vanilla ACPI is working
perfectly.

Thx, bye,
Gismo / Luca

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