Flashing Power LED…

I am looking for people with a Skylake build with a flashing power LED in sleep state. Do you have a flashing power LED, then please comment here what motherboard/processor/GPU you have. Please also link to your ACPI files.


33 thoughts on “Flashing Power LED…

  1. I don’t have a Skylake box, yet what I’ve seen in the past is that Asus boards by default use a flashing led in sleep, ASRock boards give you a choice in bios settings, and Gigabyte boards don’t flash or give you a choice…

    • Thanks. We can also enable/disable the flashing LED with help of ACPI. My father said to look at his DSDT for Asus P5K-PRO with references to the Intel datasheet, but I don’t happen to have his old DSDT’s handy.

      I also known that during the installation of the Broadwell-E processors, the power LED flashed in the installer, and sleep/wake worked. No black screen. Afterwards I flashed the BIOS and the power LED no longer flashed. Sleep/wake still worked though, but I like to check if this is somehow related to wake issues where people end up with a black screen.

  2. I have a flashing led but with Haswell-E CPU, MB Asus X99-S. Sleep doesn’t work correctly though, it goes to sleep but returns from it by itself after a short period of time, sometimes it returns okay and sometimes it restarts.

    • Thanks. And just to be absolutely sure. Your power LED flashed when your ZenBook sleeps? Would you mind trying to locate the code in the _WAK method that enables the power LED?

      • Yes it flashes when it sleeps and the strange thing is that sometimes it wakes up from sleep and sometimes it doesn’t. I tried to find a pattern but I couldn’t. I also tried to change the hibernate mode (0 3, 25, 29), but that also didn’t help.

        Probably you are looking for this code (?):

        Method (_WAK, 1, NotSerialized) // _WAK: Wake
        RWAK (Arg0)
        \_SB.PCI0.NWAK (Arg0)
        \_SB.PCI0.LPCB.SWAK (Arg0)
        OEMW (Arg0)
        Return (WAKP) /* \WAKP */

  3. I have an older setup (Sandy Bridge), with an MSI board that flashes the LED in Windows, do you want that one? (I’m not allowed to mess too much around with it, as it is my girlfriends system, but I should be able to dump the tables if you want them).

    My own system (Skylake), based on a Gigabyte board does not flash the LED in any OS (macOS, Windows, and Linux Mint).

  4. Hey piker 🙂
    If you need, i have a flashing led with ux301la (haswell i7-4558u)…
    sleep, hibernate, etc… Work perfect here, if you need sth, comment:-) cheers:-)

  5. I have an Asus Z170 Pro Gaming/i7 6700K with flashing power-led during sleep.

    at wake-up my HD led starts flashing at a constant rate of +/-3 times/sec, after a few seconds the machine reboots.

    Method (_WAK, 1, NotSerialized) // _WAK: Wake
    If (LOr (LLess (Arg0, One), LGreater (Arg0, 0x05)))
    Store (0x03, Arg0)

    RWAK (Arg0)
    \_SB.PCI0.NWAK (Arg0)
    \_SB.PCI0.LPCB.SWAK (Arg0)
    \_SB.PCI0.LPCB.SIO1.SIOW (Arg0)
    Return (WAKP) /* \WAKP */

  6. Here you go.
    At this link you can download the EFI folder (ACPI table in CLOVER\ACPI\origin) with config.plist, kext etc… plus an IOReg dump, if needed.


    OS X 10.11.6
    ASRock Fatal1ty Z170 Gaming-ITX/ac
    Intel® Core™ i7-6700 Processor
    HD 530 only with Apple Cinema Display to DisplayPort

    Confirmed flashing led on sleep and black screen on wake-up

  7. @Pike, any news about the gigabite flashing led? I have a skylake i7 h170n wifi machine, and I really would like to have a blinking led thing during sleep.

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