On 02/08/15 09:54, Matthias Apitz wrote:


I have the above cam attached to an Acer C720 Chromebook running HEAD
from January. gphoto can not read from the cam, it is detecting the name
of the cam as EOS 300D but can not read bytes from USB. With truss the
situation looks like this:

open("/dev/ugen0.3",O_RDWR,00)                   = 5 (0x5)
open("/dev/ugen0.3",O_RDWR,00)                   = 6 (0x6)
ioctl(6,USB_GET_PLUGTIME,0xbfbf9f6c)             = 0 (0x0)
ioctl(6,USB_FS_INIT,0xbfbf9f70)                  = 0 (0x0)
write(4,"\0",1)                                  = 1 (0x1)
ioctl(5,USB_IFACE_DRIVER_ACTIVE,0xbfbfa008)      ERR#6 'Device not configured'
write(2,"Detected a 'Canon:EOS 300D (norm"...,43) = 43 (0x2b)
ioctl(5,USB_DO_REQUEST,0xbfbf9050)               = 0 (0x0)
write(2,"\n",1)                                  = 1 (0x1)
write(2,"*** Error ***              \n",28)      = 28 (0x1c)
write(2,"Could not establish initial cont"...,48) = 48 (0x30)

In messages on cam attach it says:

Feb  8 09:41:06 c720-r276659 kernel: ugen0.3: <Canon Inc.> at usbus0
Feb  8 09:41:06 c720-r276659 root: Unknown USB device: vendor 0x04a9 product 
0x3084 bus uhub0

Any ideas?



Did you chmod /dev/usb/X.Y.0 properly?

Output from usbdump will help.

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