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Thread: Help with my intel mini and p1900

  1. #31
    Variable Bitrate skippy911's Avatar
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    It wont even turn on the hub if I dont have it plugged into the wall so I think it is safe to say it draws power from the 5v ac plug it uses

  2. #32
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by skippy911
    It wont even turn on the hub if I dont have it plugged into the wall so I think it is safe to say it draws power from the 5v ac plug it uses
    Then you should be good to go. Or at least have one less problem

    -dave
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  3. #33
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    Quote Originally Posted by iamgnat
    For the record, I have the Belkin 7-port hub and it only draws power from it's DC power source so it is car friendly
    Cool!!! What’s the model number - do you remember? And are you very sure that the hub doesn't do that stupid "auto sense"? cheers!!!

  4. #34
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    Quote Originally Posted by skippy911
    Is there a osx command to switch the audio port off and back on? Im wondering if a script can be written to auto run when the mini comes back from sleep. Only thing I can think is maybe the p1900 doesnt supply the right voltage or something that the audio port needs when it wakes up to know the sound is plugged in. Like i said it works great in the house so I dunno how it could be anything but the p1900 in the car doing it. I searched the mac mini forums on apple's site but couldnt find anything about it.
    yes, run sleepwatcher.. u need a .wakeup file in your home directory to put any commands/scripts in there.

    the p1900 (version 1) has a bug which causes p1900 to think its lost power if you quickly go from switch p1 to p2 (your ignition) ..its fixed via flasing prom. This is NOT the case for your sound issue but for the mini. I personally think its a mini issue rather thatn the p1900.

    with regards to your other sound....check all connections to ensure they are secure....

    HTH
    __________
    rgds, raceer


  5. #35
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by MacUsers
    Cool!!! What’s the model number - do you remember? And are you very sure that the hub doesn't do that stupid "auto sense"? cheers!!!
    Yeap. No DC power, no work.

    This is the one.

    -dave
    My pathetic worklog.
    CarFrontEnd (now it's own sub-forum!!!!)

  6. #36
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by iamgnat
    That is exactly the issue I have, I never tried it in the house though. As mentioned earlier, using the headphone on the sound card doesn't have this issue.

    As far as what causes it, no idea really. It also does it for me if I turn the Mini off and back on (or manually sleep & wake it) while the car is still running (i.e. leaving the LCD and AMPs powered through the whole sequence). Given that I am not sure how it could be the p1900, but I suppose it could have something to do with it doesn't happen on AC.

    How did you test it in the house (i.e. what was plugged in)? If you haven't, try doing a mini -> RCA connection to a Stereo AMP/Receiver since that should be closer to the in car setup and see how that does.

    Might also be worthwhile to run an extention cord out to the car and run the Mini off it and see if it has the same problem with the car stereo hooked up.
    I did some more thinking about this and a little more searching (to no avail).

    I had to bring my Mini into the office today so I could run software update as well as copy my iTunes library over (bad things happen if the Mini goes to sleep while copying from an iPod) and tested my port with a set of headphones.

    As one would expect, it did not forget about the headphones through reboots and sleeps. This got me thinking about what might be going on. Inside I used headphones. In the car I use 1/8" -> RCA -> a bunch of splitters -> AMPs.

    Logically (since i'll forget to take my headphones out to the car ) that is the real difference between the two (if you assume that the power supply is not the issue, which I believe is a safe assumption at this point). So my untested and uneducated guess is that there is something (i'm going with a resistance meassurement) different between the two. Now I guess I need to figure out how to test that theory... And if that is the case, how to fix it.

    -dave
    My pathetic worklog.
    CarFrontEnd (now it's own sub-forum!!!!)

  7. #37
    Variable Bitrate skippy911's Avatar
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    I soldered everything today and have a weird issue. The mini wont wake up when I first turn the car on. It goes to sleep, wakes, sleeps, wakes no problem. It is just the first time I power up the car I have to press the button on the mini. Now, would it be an issue with the resistor causing this? I would think not because how can the mini goto sleep and wake up after that initial powerup.

  8. #38
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by iamgnat
    Logically (since i'll forget to take my headphones out to the car ) that is the real difference between the two (if you assume that the power supply is not the issue, which I believe is a safe assumption at this point). So my untested and uneducated guess is that there is something (i'm going with a resistance meassurement) different between the two.
    And I would be wrong. I did remember to take my headphones out and they had the same problem. Guess it does have something to do with power, but it's beyond me as to why that would be. I'll drop a note to Mike and see what he says.

    -dave
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    CarFrontEnd (now it's own sub-forum!!!!)

  9. #39
    CarFrontEnd Creator iamgnat's Avatar
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    Quote Originally Posted by skippy911
    I soldered everything today and have a weird issue. The mini wont wake up when I first turn the car on. It goes to sleep, wakes, sleeps, wakes no problem. It is just the first time I power up the car I have to press the button on the mini. Now, would it be an issue with the resistor causing this? I would think not because how can the mini goto sleep and wake up after that initial powerup.
    It shouldn't be the resistor, it wouldn't boot at all if that was wrong (at least that is what I saw with mine).

    When you turn the car off, is the Mini going to sleep, staying on, or turning off right away?

    If it goes to sleep, then I would guess that something is causing it to wake and the p1900 is shutting it off. You should also be able to check your Console Logs to see if this is happening (sleep, wake, boot). Alternatively the battery level could be dipping too low because of some other drain (Console should look like: sleep, boot).

    If it is staying on then either A) something is running that is causing it to ignore the sleep (the FrontRow Remote has done this to me a couple of times when it gets hung up) or B) it is not getting the sleep signal (is the Y cable connected well?).

    If it is turning off right away, then I have no clue (assuming you haven't changed the jumpers since you fixed the similar issue earlier).

    -dave
    My pathetic worklog.
    CarFrontEnd (now it's own sub-forum!!!!)

  10. #40
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    Quote Originally Posted by iamgnat
    This is the one.
    That one looks pretty cool. Do that two top loading ports slide down inside the hole or it they always stand upright like that?

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