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  1. #1
    New Lounger
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    My Win98 provides contradictory IRQ info

    My USB ADSL modem loses power (supplied by the USB port) frequently, mostly during downloads, and on rare occasion, while basically doing nothing.

    One possible cause of the problem might be that the PCI to USB controller and onboard sound <font color=ff8c00>chip</font color=ff8c00> share the same IRQ: 11.


    I freed up IRQ 3 by disabling COM2 in the BIOS and removing it in Device Manager (which resulted in ACPI IRQ Holder for PCI IRQ Steering [which also uses IRQs 10, 11 & 12] moving from IRQ 5 to IRQ 3, leaving IRQ 5 completely unused), but Windows won't let me change the sound card's IRQ. I uncheck Use automatic settings, but when I click on Change Setting, Windows displays "This resource setting cannot be modified." I was able to change it in Safe Mode, but after rebooting in normal mode, it was back at IRQ 11.

    I removed the sound card in Device Manager, hoping that when I rebooted Windows and it found the sound card, it would assign it IRQ 5, but no such luck.

    I discovered something interesting, which I believe may be a key here. System Information shows IRQ 5 to be unused. However, double-clicking on Computer in Device Manager shows IRQ 5 to be in use by an unknown device. If someone can figure out why Windows is displaying contradictory information, the problem may be solved.

    I'm well aware that there could be any number of other reasons why my modem keeps dying, but this is what I feel should be resolved first.

  2. #2
    Uranium Lounger
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    Re: My Win98 provides contradictory IRQ info

    Anymore, managing interrupts on your own is not generally a good idea. Windows and the BIOS do a pretty good job without assistance. Have you investigated whether the current draw of your modem exceeds that provided by your system's USB port? This is even more likely if you are using other USB devices in addition to the modem.
    -Mark

  3. #3
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    Re: My Win98 provides contradictory IRQ info

    Thank you for the reply.

    Actually, Plug & Play doesn't always live up to its advertising. Read http://www.dansdata.com/sbs2.htm

    And in my case, Plug & Play definitely has something messed up.

    As I wrote at the end of my original post, I realize that the modem might be losing power for other reasons. A faulty or underpowered USB port was one of the possibilities I had in mind. It's a pain to check out, though, which is why I first want to pursue other avenues. And the contradictory IRQ information being provided by Windows is at the top of my list.

    Thanks again.

  4. #4
    Uranium Lounger
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    Re: My Win98 provides contradictory IRQ info

    Oh, I agree with ya - it isn't know affectionately as "plug and pray" for nothing. <img src=/S/laugh.gif border=0 alt=laugh width=15 height=15> What I was thinking was that you could look up the specs for the modem and find out what its power requirements are, from which point you could determine whether your system was providing that amount. 100 mA of current should be the maximum draw on an non-powered USB port (take a look at Q2 on the USB.org FAQ). Hot-plugging a USB device can also temporarily spike current demands past specifications, which could result in wonky behavior.
    -Mark

  5. #5
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    Re: My Win98 provides contradictory IRQ info

    No specs came with the modem. I've written the company to ask them, but it's nearly 11:00 at night. Will let you know.

    Thanks again.

  6. #6
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    Re: My Win98 provides contradictory IRQ info

    What is the make and model of the modem? Does nothing turn up via a search with Google?
    -Mark

  7. #7
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    Re: My Win98 provides contradictory IRQ info

    It's made by a local company at this end of the world, and a Google search a couple of weeks back came up blank.

  8. #8
    Plutonium Lounger
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    Re: My Win98 provides contradictory IRQ info

    I had a USB ADSL modem that did that. I tried everything I could think of, but it just seemed to overload the power from the USB port. I eventually replaced it with an Ethernet ADSL modem and have been happy every since.

    StuartR

  9. #9
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    Re: My Win98 provides contradictory IRQ info

    Thanks for the advice.

    I may end up going the same route.

    But since I know people who use USB modems without a problem, and the modem I have came free with the service, I want to try to solve the problem, if possible.

    Thanks again!

  10. #10
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    Re: My Win98 provides contradictory IRQ info

    One of the things I tried, that helped a bit, was to install an external powered USB hub and connect the modem to that.

    Have you checked the total power consumption on your USB hub? Look at Device Manager, expand Universal Serial Bus Controllers, Double click on each USB Root Hub and look on the Power tab.

    StuartR

  11. #11
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    Re: My Win98 provides contradictory IRQ info

    To go along with StuartR reply, if you have "Power savings" and or "Hibernation" turned on, this will mess with the USB devices when the machine tries to wake up.

    Now running HP Pavilion a6528p, with Win7 64 Bit OS.

  12. #12
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    Re: My Win98 provides contradictory IRQ info

    To StuartR: Thanks again. As I indicated at the end of my original post, I know that there could be any number of causes of my modem problem. It makes sense to try solutions that don't cost money before attempting those that do.

    There's no Power tab for the USB Root Hubs.

    To DaveA: My thanks to you as well. I'm afraid to admit this in a public setting, but my computer is set, both in the BIOS and in Energy saving, to remain at full power.

  13. #13
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    Re: My Win98 provides contradictory IRQ info

    Hard to believe that it's been 4 weeks since the last post. I just got swamped, and had to put this issue on hold.

    Recently upgraded to Second Edition, and the modem's been performing flawlessly ever since.

    Thanks to all for your time and help. I'm truly grateful.

    Take care.

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