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Thread: Building an inteligent PSU.

  1. #1
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    Building an inteligent PSU.

    OK following on form my previus thread I'm thinking of building my own PSU or modifing the M1-ATX and I have a few questions.

    Is there anyway to tell if a motherboard is in the standby state? Iv'e tryed using the power led but this remains unchanged in standby, as do the all the lines on the ATX connector.

    Is there anyway of simulating pressing the "sleep button" that windows power management refers to, the one you would normally find on a KB.

    How come some mobos turn the cpu and system fans off on standby and other don't? Is it just hit and miss or is there a reason or setting or way of changing it?

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    1 - Not all motherboards support the sleep feature.

    2 - If there is any way of changing that behavior, it would be in the BIOS setup. m Are you using S1 or S3 standby state?
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
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    It's a Jetway micro ITX wiht VIA C7 and I can't find any option for it. Iv'e just spent the last hour reading the ACPI standard (600pages).

    It looks like the mobo is only going into S1 instead of S3 like my other mobos.

    This seems a bit daft considering it's a micro-ITX amied at low power applications.

    From what I can gather the only thing that changes is the VGA out wich goes into blanking mode.

  4. #4
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by SteTommo View Post
    It's a Jetway micro ITX wiht VIA C7 and I can't find any option for it. Iv'e just spent the last hour reading the ACPI standard (600pages).

    It looks like the mobo is only going into S1 instead of S3 like my other mobos.

    This seems a bit daft considering it's a micro-ITX amied at low power applications.

    From what I can gather the only thing that changes is the VGA out wich goes into blanking mode.

    Quite frankly, and dont be offended, but if you dont know how these operations are performed on the hardware level on your motherboard, you should not be building or modifying any sort of power supply for it.

    Also the form factor has absolutely nothing to do with the ACPI setup. It is all in the BIOS.

    Also if you install XP, with ACPI turned off, disabled, or not setup properly in the BIOS, XP will think, "Hey, you got an old mobo, with no acpi" and will not install the neccessary files. Easiest/Only way to correct this is a fresh install of XP with the correct acpi settings in the bios. Look under Power Management and you will see something with S1, S3, S1&S3. If you dont see that, then something is messed up bigtime.

    Also in order for you to go into standby/hibernate, you need your video drivers installed.
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  5. #5
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    There are no ACPI settings reguarding the sleep mode, only the monitor blanking and wakeup events.

    Eitherway I think your missing the point, the system will sleep, but only in S1 but that's totally irrelevant.

    The question I'm asking is, is there anyway of simulating the sleep button press.

    And I understand that the form factor is nothign to do with it but I'm pointing out the fact that when Jetway thought lets make a micro-ITX board but then neglected to include ACPI S3 support is a bit stupid considering the boards most likely aplications.

    Also considering I design and devlop embedded microporcessor system I think an intelegent PSU would be pretty easy. I've alread looked at the ASM for the M1-ATX and it's pretty straight forward. This biggest problem is having the PSU detect the current ACPI power state of the PC, wich is why I've been reading the ACPI Specification but seeing as it's 600 pages long I thought i woudl ask on here before spending a week reading it.

  6. #6
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    Well, the prototype worked brilliently and I'll be recieving the boards from china shortly. I'll post more info soon.

  7. #7
    Variable Bitrate madkad's Avatar
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    well done mate , to the other member remember you dont learn if you dont try

    Nice one mate
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  8. #8
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    Thanks for the support, I'm really chuffed with the final design. I had a lot of help from my mate and together I think we've made a great little product that should make a lot of ppls car pcs more functional

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