Suspend powers off machine

[Eric Anderson]

Nate Lawson wrote:
> Eric Anderson wrote:
> 
>> I'm going to have some time on my hands next week, and I'd like to 
>> hunt down an issue with my laptop.  When attempting to go into S3, 
>> instead of going into S3, it powers off (uncleanly).  Can anyone tell 
>> me where this might be happening in the code, so I can start the 
>> printf debugging process? 
> 
> 
> It's nearly 100% certain it happens in AcpiEnterSleepState at the write 
> to PM1A.  This is in sys/contrib/dev/acpica/hwsleep.c

You're right - it happens here:
Status = AcpiHwRegisterWrite (ACPI_MTX_DO_NOT_LOCK, ACPI_REGISTER_PM1A_CONTROL, PM1AControl);
In that subroutine..

> In thinking about it, my best theory is that the southbridge interprets 
> this write as an S4/S5 transition.  Perhaps the ASL gives the wrong 
> value to write?  Perhaps the chipset is not being prepared for S3 
> correctly.  In any case, better chipset specs would probably help 
> diagnose this.

Not sure what to look for in the ASL for the valid/invalid values.  What chipset info do you need?


> Other possibilities are that the setting of SLP_EN should be done at the 
> same time as the write with the SLP_TYP value (i.e. write 
> SLP_TYPE_S3|SLP_EN instead of splitting the write into two phases).  It 
> also may be that the previous steps like disabling BM ctrl are not 
> appropriate for some chipsets.
> 
> If you can get more info, I can refine this theory.

I'm going to keep doing some printf's in the hwregs.c file to see if I can track down anything closer.

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
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