On Fri, 16 Sep 2005, Leslie Katz wrote:
> Alan,
>
> I've been wasting your time. I had not edited grub.conf correctly. I've
> now done it correctly and have set out below the steps I've taken and
> the outcome:
>
> 1. output of dmesg after booting up with no devices plugged into any
> usb port and then running lsusb -v:
...
> 2. additional dmesg output found after DSC plugged in:
>
> usb 3-2: new full speed USB device using uhci_hcd and address 2
>
> 3. after running gphoto2 --auto-detect and then gphoto2 --abilities and
> getting appropriate output each time, found no additional dmesg output
>
> 4. after running gphoto2 -P and getting following usual error message,
>
> *** Error ***
> An error occurred in the io-library ('Error updating the port
> settings'): Could not release interface 0 (Invalid argument).
> *** Error (-37: 'Error updating the port settings') ***
>
>
> found additional dmesg output as follows:
>
> usb 3-2: usbdev_ioctl: GETDRIVER
> usb 3-2: usbdev_ioctl: CLAIMINTERFACE
> usb 3-2: usbdev_ioctl: RELEASEINTERFACE
> usb 3-2: usbdev_ioctl: SETCONFIGURATION
> usb 3-2: usbdev_ioctl: RELEASEINTERFACE
> usb 3-2: usbdev_ioctl: RELEASEINTERFACE
>
> I can only apologise for not following your instructions properly
> before.
>
> I hope the above information discloses what's been going wrong.
It's a pretty good indicator. At the end there are two RELEASEINTERFACE
calls with no matching CLAIMINTERFACE calls beforehand. I still haven't
had time to get the libgphoto2 source, but this tells me where in it to
look.
Alan Stern
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