Unable to make ptpcam working

After finally getting libptp2 to compile I find that ptpcam does not work.

This has worked perfectly fine before with the same camera using Slackware 12.0, I am now using Slackware 13.1 and ptpcam will simply not work.

The error is as follows:

Code:

x86_1# ptpcam -l Listing devices... bus/dev vendorID/prodID device model ERROR: Could not open session! Try to reset the camera.

I have tried to reset with "ptpcam -r", I have also tried to disconnect and reconnect the camera to the USB system, I have tried to reboot the computer, I have tried to use different versions of libptp2 -- all to no avail.

The strace shows the issue is apparently a failed ioctl(), although I have no idea why it fails:

Code:

open("/dev/bus/usb/002/004", O_RDWR) = 6 write(4, "\1"..., 1) = 1 read(3, "\1"..., 1) = 1 ioctl(6, USBDEVFS_SETCONFIGURATION, 0xbff18044) = 0 ioctl(6, USBDEVFS_CLAIMINTERFACE, 0xbff18014) = 0 ioctl(134577232, UI_DEV_DESTROY or USBDEVFS_BULK, 0xbff17f90) = -1 EBADF (Bad file descriptor) write(2, "ERROR: Could not open session!\nTr"..., 56ERROR: Could not open session! Try to reset the camera. ) = 56 ioctl(6, USBDEVFS_RELEASEINTERFACE, 0xbff18044) = 0 write(1, "\n"..., 1 ) = 1 exit_group(0) = ?

I have verified that the camera is working in Windows 7 on the same physical computer and I can see the camera from lsusb and dmesg output when I connect it to the USB system.

This system is Slackware 13.1, Linux x86_1 2.6.33.4-smp #2 SMP Wed May 12 22:47:36 CDT 2010 i686 Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz GenuineIntel GNU/Linux.