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Question about DSDT hack

DISCUSSION Lorenzo Colitti 1 participant 1 message Mar 6, 2005 ACPI

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Lorenzo Colitti

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Hi,

as reported a few weeks ago on this list, when my nc6000 resumes from sleep I don't get events for battery or AC adapter insertion/removal. This means that if I suspend on AC power and resume on battery I don't know how much the laptop is going to live unless I reload the battery and ac modules.

I have traced this to the _WAK function in my DSDT, which, among other things, does the following:

Quoted 9 lines
        Store (\_SB.C044.C057.C0E7.C127 (), Local2)
        \_SB.C044.C057.C0E7.C0EC (0x03, 0xFF)
        Store (\_SB.C044.C057.C0E7.C0ED (), Local1)
        Store (\_SB.C044.C057.C0E7.C127 (), Local3)
        XOr (Local2, Local3, Local3)
        If (Local3)
        {
            Notify (\_SB.C134, 0x80)
        }

C134 is the AC adapter, C136 and C137 are the battery slots. As can be seen from the above code, ACPI does nothing at all about the batteries and only notifies the AC adapter event if some complicated condition occurs. Hacking blindly, I changed the last few lines to the following:

Quoted 4 lines
        XOr (Local2, Local3, Local3)
        Notify (\_SB.C134, 0x80)
        Notify (\_SB.C136, 0x80)
        Notify (\_SB.C137, 0x80)

which unconditionally notifies battery and AC adapter events. It seems to work OK, but I haven't the faintest idea what the original code is trying to do or even what the new code does (for example, what does the 0x80 do?). Is there someone who can explain it to me?

Further debug info: my DSDT is attached, and this is what I see in /proc/acpi:

Quoted 10 lines
flyingsaucer:/proc/acpi# ls ac_adapter/ battery/ button/ embedded_controller/ fan/ power_resource/
ac_adapter/:
C134

battery/:
C136 C137

button/:
lid power sleep

Quoted 8 lines

embedded_controller/:
C0E7

fan/:
C20F C210 C211 C212

power_resource/:
C0E6 C13D C16D C184 C18B C195 C20B C20C C20D C20E

Any pointers appreciated. :)

Thanks,
Lorenzo

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