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Hi... 3 days passed sinse I start searching for a solution for this error: Code: localhost kernel: SUBMIT_URB: usb_submit_urb failed,status=-28 I have a usb modem (BeWan unicorn), I insert the ...
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  1. #1
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    USB problem when using usb modem


    Hi...

    3 days passed sinse I start searching for a solution for this error:
    Code:
    localhost kernel: SUBMIT_URB: usb_submit_urb failed,status=-28
    I have a usb modem (BeWan unicorn), I insert the compiled module into kernel, connect to the internet using pppd (pppoatm) and got internet for about 10 sec, after that, the modem freezes and I can't use the connection anymore until I restart the dammed usbcore module. I get the above error at syslog (/var/log/syslog and messages)

    I think it's a power problem related to the kernel power management, but the modem works well on win98... :

  2. #2
    Linux Guru sarumont's Avatar
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    What kernel version and distro are you running?
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    I'm currently using Kernel 2.6 (Mandrake 10.0), and I tried the 2.4 version that comes in the same distribution. With the 2.4 version the connection keeps alive for about 10 min instead of 10 sec from kernel 2.6.

    I'm using a P2 233Mhz with 64 MB Ram, and of course USB-1.1

  4. #4
    Linux Guru sarumont's Avatar
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    Ok...Do you have APM or ACPI enabled? If so, boot with them off to make sure this isn't throwing a wrench in the works.

    In grub, append these to your kernel line:

    Code:
    acpi=off noapm
    I believe those will disable that power management. An alternative would be to compile a new kernel without them in there.
    "Time is an illusion. Lunchtime, doubly so."
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  5. #5
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    well... i did than and can't resolve anything, I also tried to use usb-ohci/ehci-hcd intead of uhci-hcd, but with this configuration, I can't get the modem on, so there's another option less....

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