[Fwd: Suspend powers off machine]
It seems on Eric's Dell D600, entering S3 powers off the system (similar to S5). It also apparently works on Linux. Anyone have an idea what we're doing wrong?
Thanks,
Nate
-------- Original Message --------
Subject: Re: Suspend powers off machine
Date: Mon, 11 Apr 2005 22:06:52 -0500
From: Eric Anderson <anderson-EcDrcr+ShHtWk0Htik3J/[email protected]>
References: <42552573.6040902-EcDrcr+ShHtWk0Htik3J/[email protected]> <[email protected]>
Quoted 6 lines · Nate Lawson
Quoted 1 line · Eric Anderson
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..
Quoted 5 lines
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.
Other possibilities are that the setting of
SLP_ENshould be done at the same time as the write with theSLP_TYPvalue (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.
Signature · 8 lines
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