IBM ThinkPad T42 ACPI suspend woes

[Julien Poissonnier]

Tim: I replied to your other thread.

Jan: did you apply the ACPI and swsusp2 patches to the Ubuntu kernel 
source or to the vanilla kernel ? Somehow I can't get swsusp2 to apply 
to the Ubuntu tree.

Jan Kokoska wrote:
> Yes. Instead of suspend to memory that you are using right now (and
> which is really a compromise between resume period and actual power
> savings), use suspend to disk.
> 
> I am afraid the procedure I was most happy with in the end involved
> pathcing 2.6.8 kernel with new ACPI [0] and swsusp2 [1] and also special
> key module for thinkpads [2].
> 
> Linux suspend to disk is a bit of hack and it took a while to get it
> properly working (swsusp and pmdisk in standard kernel don't work too
> well, at least for me). Wake-up is in fact partial boot where swsusp2
> code takes over after ACPI initialization. Pretty fast, though.
> 
> My Thinkpad R40
> ------------------------------------------
> suspend 	suspend/resume	battery
> method		time		duration
> ------------------------------------------
> mem 		3s/10s		10-15 hours
> disk		10s/30s		unlimited
> 
> Regards,
> Jan
> 
> [0] http://acpi.sourceforge.net/
> [1] http://softwaresuspend.berlios.de/
> [2] http://ibm-acpi.sourceforge.net/
> 
>