Re: Support for "standby" in ACPI4Linux

[Luca Capello <luca-wlebWZzHoyE@public.gmane.org>]

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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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