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Thread: ACPI wakeup

  1. #1
    Join Date
    Jun 2013

    ACPI wakeup

    Hello! I am a BIOS developer and now i am trying to enable S3 wakeup from USB keyboard.
    After boot, if i execute in terminal command «cat /proc/acpi/wakeup» i get:

    Device S-state Status Sysfs node
    PCI0 S5 disabled no-busci0000:00
    HDEF S4 disabled pci:0000:00:1b.0
    RP01 S5 disabled pci:0000:00:1c.0
    RP02 S5 disabled pci:0000:00:1c.1
    RP03 S5 disabled pci:0000:00:1c.2
    RP04 S5 disabled pci:0000:00:1c.3
    RP05 S5 disabled pci:0000:00:1c.4
    RP06 S5 disabled pci:0000:00:1c.5
    USB1 S3 disabled pci:0000:00:1d.0
    USB2 S3 disabled pci:0000:00:1d.1
    USB3 S3 disabled pci:0000:00:1d.2
    USB4 S3 disabled pci:0000:00:1d.3
    EHC1 S3 disabled pci:0000:00:1d.7
    MODM S4 disabled
    COMA S3 disabled pnp:00:08
    COMB S3 disabled pnp:00:09

    At my guess, current devices are devices from DSDT table with _PRW method. But for some reason wakeup for them disabled by default.
    I can enable wakeup for keyboard (in my case it is USB1) with:

    echo PCI0 > /proc/acpi/wakeup

    echo USB1 > /proc/acpi/wakeup

    I think, that these commands says to OS, that it should enable appropriate bits in ACPI GPE0_EN register before going to S3 (what bits exactly is defined in PCI0._PRW and USB1._PRW)

    But this is not the end. I think OS power off USB controller when it goes to S3. To fix this i found device USB number from dmesg:

    [ 2.724374] input: LITEON Technology USB Multimedia Keyboard as /devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/input/input6

    And executed command «echo enabled > /sys/bus/usb/devices/2-2/power/wakeup»

    And only now wakeup from USB works.

    My question is, how i should change DSDT, to avoid all of these commands?

  2. #2
    dino99's Avatar
    dino99 is offline Ubuntu addict and loving it
    Join Date
    Jun 2006
    Nux Jam
    Ubuntu Development Release

    Re: ACPI wakeup

    hello "bios dev"

    as you might already knows, the bios take control of the hardware only; there is no relationship with an OS here as the Os start way later. So if that DSDT table is not fully set or badly set, then an OS like linux report errors/warnings and be able to take control over the initial bios settings if the OS detect something wrong or not optimal. A tool like checkbox and/or fwts can help a lot to find the mismatch mess; dmidecode is also usefull, and "sudo lspci -vvnn" too.

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