Hello friends!
I tried 3 different cameras Canon 50D, result is the same.
After power on, camera detected by gphoto2:
 
root@raspberrypi:/camsoft# gphoto2 --auto-detect
Model                          Port
----------------------------------------------------------
Canon EOS 50D                  usb:001,047
 
then, when do command "gphoto2 --list-files"
output is:
 
root@raspberrypi:/camsoft# gphoto2 --list-files
There is no file in folder '/'.
There is no file in folder '/store_00010001'.
 
*** Error ***
PTP I/O error
*** Error (-1: 'Unspecified error') ***
 
Debug file in attachment. Any help appreciated.
 
 
-- 
Vladimir
 
0.000346 main(2): ALWAYS INCLUDE THE FOLLOWING LINES WHEN SENDING DEBUG 
MESSAGES TO THE MAILING LIST:
0.000502 main(2): gphoto2 2.5.4
0.000568 main(2): gphoto2 has been compiled with the following options:
0.000598 main(2):  + gcc (C compiler used)
0.000625 main(2):  + popt (mandatory, for handling command-line parameters)
0.000651 main(2):  + exif (for displaying EXIF information)
0.000676 main(2):  + cdk (for accessing configuration options)
0.000700 main(2):  + aa (for displaying live previews)
0.000725 main(2):  + jpeg (for displaying live previews in JPEG format)
0.000750 main(2):  + readline (for easy navigation in the shell)
0.000781 main(2): libgphoto2 2.5.4
0.000818 main(2): libgphoto2 has been compiled with the following options:
0.000845 main(2):  + all camlibs
0.000870 main(2):  + gcc (C compiler used)
0.000895 main(2):  + ltdl (for portable loading of camlibs)
0.000919 main(2):  + EXIF (for special handling of EXIF files)
0.000950 main(2): libgphoto2_port 0.10.0
0.000987 main(2): libgphoto2_port has been compiled with the following options:
0.001014 main(2):  + gcc (C compiler used)
0.001039 main(2):  + ltdl (for portable loading of camlibs)
0.001063 main(2):  + USB (libusb1, for USB cameras)
0.001088 main(2):  + serial (for serial cameras)
0.001112 main(2):  + no resmgr (serial port access and locking)
0.001137 main(2):  + no ttylock (serial port locking)
0.001161 main(2):  + no lockdev (serial port locking)
0.001186 main(2): CAMLIBS env var not set, using compile-time default instead
0.001211 main(2): IOLIBS env var not set, using compile-time default instead
0.001235 main(2): invoked with following arguments:
0.001259 main(2):   --debug
0.001283 main(2):   --debug-logfile=my-logfile.txt
0.001307 main(2):   --list-files
0.001454 setting/gphoto2-setting.c(2): Creating $HOME/.gphoto
0.001674 setting/gphoto2-setting.c(2): Loading settings from file 
"/root/.gphoto/settings"
0.002649 main(2): The user has not specified both a model and a port. Try to 
figure them out.
0.002720 gphoto2-port-info-list(2): Using ltdl to load io-drivers from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0'...
0.003162 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/disk'.
0.004068 gphoto2-port/disk(2): found fstab fsname proc
0.004124 gphoto2-port/disk(2): found fstab fsname /dev/mmcblk0p1
0.004214 gphoto2-port/disk(2): found fstab fsname /dev/mmcblk0p2
0.004282 gphoto2-port/disk(2): found fstab fsname tmpimg
0.004676 gphoto2-port/disk(2): found mtab fsname /dev/root
0.004738 gphoto2-port/disk(2): found mtab fsname devtmpfs
0.004782 gphoto2-port/disk(2): found mtab fsname sysfs
0.004822 gphoto2-port/disk(2): found mtab fsname proc
0.004860 gphoto2-port/disk(2): found mtab fsname tmpfs
0.004935 gphoto2-port/disk(2): found mtab fsname devpts
0.004977 gphoto2-port/disk(2): found mtab fsname tmpfs
0.005049 gphoto2-port/disk(2): found mtab fsname tmpfs
0.005123 gphoto2-port/disk(2): found mtab fsname tmpfs
0.005215 gphoto2-port/disk(2): found mtab fsname cgroup
0.005256 gphoto2-port/disk(2): found mtab fsname cgroup
0.005293 gphoto2-port/disk(2): found mtab fsname cgroup
0.005330 gphoto2-port/disk(2): found mtab fsname cgroup
0.005367 gphoto2-port/disk(2): found mtab fsname cgroup
0.005480 gphoto2-port/disk(2): found mtab fsname cgroup
0.005520 gphoto2-port/disk(2): found mtab fsname cgroup
0.005558 gphoto2-port/disk(2): found mtab fsname systemd-1
0.005595 gphoto2-port/disk(2): found mtab fsname debugfs
0.005680 gphoto2-port/disk(2): found mtab fsname mqueue
0.005720 gphoto2-port/disk(2): found mtab fsname configfs
0.005811 gphoto2-port/disk(2): found mtab fsname tmpimg
0.005888 gphoto2-port/disk(2): found mtab fsname /dev/mmcblk0p1
0.006128 gphoto2-port-info-list(2): Could not load port driver list: 
'Unspecified error'.
0.006173 gphoto2-port-info-list(2): Loaded '' ('^disk:') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/disk'.
0.006214 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/ptpip'.
0.006764 gphoto2-port-info-list(2): Loaded 'PTP/IP Connection' ('ptpip:') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/ptpip'.
0.006858 gphoto2-port-info-list(2): Loaded '' ('^ptpip:') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/ptpip'.
0.006901 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/serial'.
0.007873 gphoto2-port-info-list(2): Loaded 'Serial Port 0' 
('serial:/dev/ttyS0') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/serial'.
0.007922 gphoto2-port-info-list(2): Loaded '' ('^serial:') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/serial'.
0.007964 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usb1'.
0.016241 gphoto2-port-info-list(2): Loaded '' ('^usb:') from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usb1'.
0.016346 gphoto2-port-info-list(2): Loaded 'Universal Serial Bus' 
('usb:001,052') from '/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usb1'.
0.016388 gphoto2-port-info-list(2): Loaded 'Universal Serial Bus' 
('usb:001,003') from '/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usb1'.
0.016430 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usbdiskdirect'.
0.017163 gphoto2-port-info-list(2): Called for filename 
'/usr/lib/arm-linux-gnueabihf/libgphoto2_port/0.10.0/usbscsi'.
0.017801 gphoto2-port-info-list(2): Counting entries (8 available)...
0.017851 gphoto2-port-info-list(2): 4 regular entries available.
0.017921 gphoto2-abilities-list(2): Using ltdl to load camera libraries from 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4'...
0.020643 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/adc65'.
0.020725 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/agfa_cl20'.
0.020757 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/aox'.
0.020787 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/ax203'.
0.020816 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/barbie'.
0.020844 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/canon'.
0.020872 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/casio_qv'.
0.020901 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/clicksmart310'.
0.020929 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/digigr8'.
0.020957 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/digita'.
0.020985 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/dimagev'.
0.021013 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/dimera3500'.
0.021042 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/directory'.
0.021070 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/enigma13'.
0.021099 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/fuji'.
0.021127 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/gsmart300'.
0.021155 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/hp215'.
0.021183 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/iclick'.
0.021210 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/jamcam'.
0.021238 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/jd11'.
0.021266 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/jl2005a'.
0.021294 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/jl2005c'.
0.021322 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/kodak_dc120'.
0.021350 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/kodak_dc210'.
0.021378 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/kodak_dc240'.
0.021450 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/kodak_dc3200'.
0.021479 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/kodak_ez200'.
0.021508 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/konica'.
0.021536 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/konica_qm150'.
0.021564 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/largan'.
0.021591 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/lg_gsm'.
0.021619 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/mars'.
0.021647 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/mustek'.
0.021674 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/panasonic_coolshot'.
0.021702 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/panasonic_dc1000'.
0.021731 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/panasonic_dc1580'.
0.021759 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/panasonic_l859'.
0.021787 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/pccam300'.
0.021815 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/pccam600'.
0.021843 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/pentax'.
0.021870 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/polaroid_pdc320'.
0.021898 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/polaroid_pdc640'.
0.021927 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/polaroid_pdc700'.
0.021955 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/ptp2'.
0.021983 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/ricoh'.
0.022011 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/ricoh_g3'.
0.022038 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/samsung'.
0.022066 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sierra'.
0.022095 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sipix_blink2'.
0.022123 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sipix_web2'.
0.022150 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/smal'.
0.022178 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sonix'.
0.022205 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sony_dscf1'.
0.022233 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sony_dscf55'.
0.022261 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/soundvision'.
0.022288 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/spca50x'.
0.022316 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sq905'.
0.022353 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/st2205'.
0.022383 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/stv0674'.
0.022411 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/stv0680'.
0.022440 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/sx330z'.
0.022468 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/topfield'.
0.022496 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/toshiba_pdrm11'.
0.022523 gphoto2-abilities-list(2): Found 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/tp6801'.
0.022583 gp-abilities-list(2): Found 64 camera drivers.
0.142250 gphoto2-port-info-list(2): Counting entries (8 available)...
0.142397 gphoto2-port-info-list(2): 4 regular entries available.
0.142423 gphoto2-port(2): Creating new device...
0.142457 gphoto2-port-info-list(2): Getting info of entry 0 (8 available)...
0.142909 gphoto2-port(2): Setting settings...
0.142944 gphoto2-port-info-list(2): Getting info of entry 1 (8 available)...
0.143237 gphoto2-port(2): Setting timeout to 500 millisecond(s)...
0.143259 gphoto2-port(2): Setting settings...
0.143284 gphoto2-port-info-list(2): Getting info of entry 2 (8 available)...
0.147041 gphoto2-port(2): Setting timeout to 5000 millisecond(s)...
0.147096 gphoto2-port(2): Setting settings...
0.147120 libusb1(2): gp_port_usb_update(old int=0, conf=-1, alt=-1) port 
usb:001,052, (new int=0, conf=-1, alt=-1) port usb:001,052
0.147137 gphoto2-abilities-list.c(1): Auto-detecting USB cameras...
0.147761 libusb1(1): Looking for USB device (vendor 0x4a9, product 0x319b)... 
found.
0.147919 libusb1(1): Detected defaults: config 1, interface 0, altsetting 0, 
inep 81, outep 02, intep 83, class 06, subclass 01
0.147940 gphoto2-abilities-list.c(2): Found 'Canon EOS 50D' (0x4a9,0x319b)
0.147973 gphoto2-port-info-list(2): Getting info of entry 3 (8 available)...
0.152133 gphoto2-port(2): Setting timeout to 5000 millisecond(s)...
0.152195 gphoto2-port(2): Setting settings...
0.152217 libusb1(2): gp_port_usb_update(old int=0, conf=-1, alt=-1) port 
usb:001,003, (new int=0, conf=-1, alt=-1) port usb:001,003
0.152234 gphoto2-abilities-list.c(1): Auto-detecting USB cameras...
0.154636 gphoto2-port-usb(1): Looking for USB device (class 0x29a, subclass, 
0xffffffff, protocol 0xffffffff)...
0.156518 gphoto2-port-usb(1): Looking for USB device (class 0x6, subclass, 0x1, 
protocol 0x1)...
0.156647 gphoto2-port(2): Freeing port...
0.156672 gphoto2-port(2): Closing port...
0.157145 gphoto2-camera(2): Setting abilities ('Canon EOS 50D')...
0.157170 gphoto2-setting(2): Setting key 'model' to value 'Canon EOS 50D' 
(gphoto2)
0.157191 gphoto2-setting(2): Saving 2 setting(s) to file 
"/root/.gphoto/settings"
0.157561 gphoto2-port-info-list(2): Looking for path 'usb:001,052' (8 entries 
available)...
0.157603 gphoto2-port-info-list(2): Getting info of entry 2 (8 available)...
0.157627 gphoto2-camera(2): Setting port info for port 'Universal Serial Bus' 
at 'usb:001,052'...
0.161467 gphoto2-port(2): Setting timeout to 5000 millisecond(s)...
0.161529 gphoto2-port(2): Setting settings...
0.161552 libusb1(2): gp_port_usb_update(old int=0, conf=-1, alt=-1) port 
usb:001,052, (new int=0, conf=-1, alt=-1) port usb:001,052
0.161574 gphoto2-setting(2): Setting key 'port' to value 'usb:001,052' (gphoto2)
0.161594 gphoto2-setting(2): Saving 2 setting(s) to file 
"/root/.gphoto/settings"
0.180662 foreach(2): Executing action 'List Files' for folder '/'.
0.180695 gphoto2-camera(2): Listing files in '/'...
0.180716 gphoto2-camera(2): Initializing camera...
0.180827 libusb1(1): Looking for USB device (vendor 0x4a9, product 0x319b)... 
found.
0.181014 libusb1(1): Detected defaults: config 1, interface 0, altsetting 0, 
inep 81, outep 02, intep 83, class 06, subclass 01
0.181033 gphoto2-camera(2): Loading 
'/usr/lib/arm-linux-gnueabihf/libgphoto2/2.5.4/ptp2'...
0.183160 gphoto2-port(2): Opening USB port...
0.183218 libusb1(2): gp_port_usb_open()
0.183351 libusb1(2): claiming interface 0
0.183551 ptp2(2): maxpacketsize 512
0.183610 gphoto2-port(2): Setting timeout to 1500 millisecond(s)...
0.183670 ptp(2): PTP: Opening session
0.183697 gphoto2-port(2): Writing 16=0x10 byte(s) to port...
0.183723 gphoto2-port(3): Hexdump of 16 = 0x10 bytes follows:
0000  10 00 00 00 01 00 02 10-00 00 00 00 01 00 00 00  ................

0.183898 ptp2/ptp_usb_getresp(2): reading response
0.183915 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.183942 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.183958 libusb1(2): reading with timeout 1500
0.185142 libusb1(2): ret = 0
0.185165 gphoto2-port(2): Could only read 12 out of 1024 byte(s)
0.185187 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 03 00 01 20-00 00 00 00              ....... ....    

0.185238 gphoto2-port(2): Setting timeout to 20000 millisecond(s)...
0.185260 gphoto2-port(2): Writing 12=0xc byte(s) to port...
0.185280 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 01 00 01 10-01 00 00 00              ............    

0.185356 ptp2/ptp_usb_getdata(2): reading data
0.185372 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.185393 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.185408 libusb1(2): reading with timeout 20000
0.187736 libusb1(2): ret = 0
0.187759 gphoto2-port(2): Could only read 449 out of 1024 byte(s)
0.187817 gphoto2-port(3): Hexdump of 449 = 0x1c1 bytes follows:
0000  c1 01 00 00 02 00 01 10-01 00 00 00 64 00 06 00  ............d...
0010  00 00 c8 00 00 00 00 71-00 00 00 14 10 15 10 16  .......q........
0020  10 01 10 02 10 03 10 06-10 04 10 01 91 05 10 02  ................
0030  91 07 10 08 10 03 91 09-10 04 91 0a 10 1b 10 07  ................
0040  91 0c 10 0d 10 0b 10 05-91 0f 10 06 91 10 91 27  ...............'
0050  91 0b 91 08 91 09 91 0c-91 0e 91 0f 91 25 91 26  .............%.&
0060  91 15 91 14 91 13 91 16-91 17 91 20 91 f0 91 18  ........... ....
0070  91 21 91 f1 91 1d 91 0a-91 1b 91 1c 91 1e 91 1a  .!..............
0080  91 53 91 54 91 60 91 55-91 57 91 58 91 59 91 5a  .S.T.`.U.W.X.Y.Z
0090  91 1f 91 fe 91 ff 91 28-91 29 91 2b 91 01 98 02  .......(.).+....
00a0  98 03 98 04 98 05 98 c0-91 c1 91 c2 91 c3 91 c4  ................
00b0  91 c5 91 c6 91 c7 91 c8-91 c9 91 ca 91 cb 91 cc  ................
00c0  91 ce 91 cf 91 e1 91 e2-91 e3 91 e4 91 e5 91 e6  ................
00d0  91 e7 91 e8 91 e9 91 ea-91 eb 91 ec 91 ed 91 f2  ................
00e0  91 f3 91 f4 91 f7 91 22-91 23 91 24 91 f5 91 f6  .......".#.$....
00f0  91 52 90 53 90 57 90 58-90 59 90 5a 90 07 00 00  .R.S.W.X.Y.Z....
0100  00 09 40 04 40 05 40 03-40 02 40 07 40 01 c1 03  ..@.@.@.@.@.@...
0110  00 00 00 02 d4 07 d4 06-d4 01 00 00 00 01 38 0b  ..............8.
0120  00 00 00 01 30 02 30 06-30 0a 30 08 30 01 38 01  ....0.0.0.0.0.8.
0130  b1 03 b1 02 bf 00 38 04-b1 0b 43 00 61 00 6e 00  ......8...C.a.n.
0140  6f 00 6e 00 20 00 49 00-6e 00 63 00 2e 00 00 00  o.n. .I.n.c.....
0150  0e 43 00 61 00 6e 00 6f-00 6e 00 20 00 45 00 4f  .C.a.n.o.n. .E.O
0160  00 53 00 20 00 35 00 30-00 44 00 00 00 08 33 00  .S. .5.0.D....3.
0170  2d 00 31 00 2e 00 30 00-2e 00 37 00 00 00 21 36  -.1...0...7...!6
0180  00 65 00 39 00 66 00 64-00 61 00 62 00 38 00 61  .e.9.f.d.a.b.8.a
0190  00 38 00 62 00 65 00 34-00 38 00 62 00 32 00 62  .8.b.e.4.8.b.2.b
01a0  00 35 00 34 00 34 00 61-00 36 00 64 00 62 00 38  .5.4.4.a.6.d.b.8
01b0  00 63 00 34 00 30 00 38-00 37 00 39 00 39 00 00  .c.4.0.8.7.9.9..
01c0  00                     -                         .               

0.187844 ptp2/ptp_usb_getresp(2): reading response
0.187858 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.187879 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.187893 libusb1(2): reading with timeout 20000
0.188447 libusb1(2): ret = 0
0.188470 gphoto2-port(2): Could only read 12 out of 1024 byte(s)
0.188491 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 03 00 01 20-01 00 00 00              ....... ....    

0.188550 PTP2/ptp2/library.c(2): Device info:
0.188565 PTP2/ptp2/library.c(2): Manufacturer: Canon Inc.
0.188579 PTP2/ptp2/library.c(2):   Model: Canon EOS 50D
0.188591 PTP2/ptp2/library.c(2):   device version: 3-1.0.7
0.188604 PTP2/ptp2/library.c(2):   serial number: 
'6e9fdab8a8be48b2b544a6db8c408799'
0.188618 PTP2/ptp2/library.c(2): Vendor extension ID: 0x0000000b
0.188631 PTP2/ptp2/library.c(2): Vendor extension version: 200
0.188643 PTP2/ptp2/library.c(2): Vendor extension description: (null)
0.188657 PTP2/ptp2/library.c(2): Functional Mode: 0x0000
0.188669 PTP2/ptp2/library.c(2): PTP Standard Version: 100
0.188681 PTP2/ptp2/library.c(2): Supported operations:
0.188694 PTP2/ptp2/library.c(2):   0x1014
0.188706 PTP2/ptp2/library.c(2):   0x1015
0.188719 PTP2/ptp2/library.c(2):   0x1016
0.188731 PTP2/ptp2/library.c(2):   0x1001
0.188743 PTP2/ptp2/library.c(2):   0x1002
0.188756 PTP2/ptp2/library.c(2):   0x1003
0.188781 PTP2/ptp2/library.c(2):   0x1006
0.188794 PTP2/ptp2/library.c(2):   0x1004
0.188807 PTP2/ptp2/library.c(2):   0x9101
0.188819 PTP2/ptp2/library.c(2):   0x1005
0.188831 PTP2/ptp2/library.c(2):   0x9102
0.188843 PTP2/ptp2/library.c(2):   0x1007
0.188856 PTP2/ptp2/library.c(2):   0x1008
0.188868 PTP2/ptp2/library.c(2):   0x9103
0.188880 PTP2/ptp2/library.c(2):   0x1009
0.188893 PTP2/ptp2/library.c(2):   0x9104
0.188905 PTP2/ptp2/library.c(2):   0x100a
0.188917 PTP2/ptp2/library.c(2):   0x101b
0.188930 PTP2/ptp2/library.c(2):   0x9107
0.188942 PTP2/ptp2/library.c(2):   0x100c
0.188954 PTP2/ptp2/library.c(2):   0x100d
0.188966 PTP2/ptp2/library.c(2):   0x100b
0.188978 PTP2/ptp2/library.c(2):   0x9105
0.188991 PTP2/ptp2/library.c(2):   0x100f
0.189003 PTP2/ptp2/library.c(2):   0x9106
0.189015 PTP2/ptp2/library.c(2):   0x9110
0.189028 PTP2/ptp2/library.c(2):   0x9127
0.189040 PTP2/ptp2/library.c(2):   0x910b
0.189052 PTP2/ptp2/library.c(2):   0x9108
0.189064 PTP2/ptp2/library.c(2):   0x9109
0.189077 PTP2/ptp2/library.c(2):   0x910c
0.189089 PTP2/ptp2/library.c(2):   0x910e
0.189101 PTP2/ptp2/library.c(2):   0x910f
0.189114 PTP2/ptp2/library.c(2):   0x9125
0.189126 PTP2/ptp2/library.c(2):   0x9126
0.189138 PTP2/ptp2/library.c(2):   0x9115
0.189151 PTP2/ptp2/library.c(2):   0x9114
0.189163 PTP2/ptp2/library.c(2):   0x9113
0.189175 PTP2/ptp2/library.c(2):   0x9116
0.189188 PTP2/ptp2/library.c(2):   0x9117
0.189200 PTP2/ptp2/library.c(2):   0x9120
0.189212 PTP2/ptp2/library.c(2):   0x91f0
0.189225 PTP2/ptp2/library.c(2):   0x9118
0.189237 PTP2/ptp2/library.c(2):   0x9121
0.189249 PTP2/ptp2/library.c(2):   0x91f1
0.189262 PTP2/ptp2/library.c(2):   0x911d
0.189274 PTP2/ptp2/library.c(2):   0x910a
0.189286 PTP2/ptp2/library.c(2):   0x911b
0.189298 PTP2/ptp2/library.c(2):   0x911c
0.189311 PTP2/ptp2/library.c(2):   0x911e
0.189323 PTP2/ptp2/library.c(2):   0x911a
0.189335 PTP2/ptp2/library.c(2):   0x9153
0.189347 PTP2/ptp2/library.c(2):   0x9154
0.189360 PTP2/ptp2/library.c(2):   0x9160
0.189372 PTP2/ptp2/library.c(2):   0x9155
0.189384 PTP2/ptp2/library.c(2):   0x9157
0.189396 PTP2/ptp2/library.c(2):   0x9158
0.189408 PTP2/ptp2/library.c(2):   0x9159
0.189421 PTP2/ptp2/library.c(2):   0x915a
0.189433 PTP2/ptp2/library.c(2):   0x911f
0.189445 PTP2/ptp2/library.c(2):   0x91fe
0.189458 PTP2/ptp2/library.c(2):   0x91ff
0.189470 PTP2/ptp2/library.c(2):   0x9128
0.189482 PTP2/ptp2/library.c(2):   0x9129
0.189494 PTP2/ptp2/library.c(2):   0x912b
0.189507 PTP2/ptp2/library.c(2):   0x9801
0.189519 PTP2/ptp2/library.c(2):   0x9802
0.189531 PTP2/ptp2/library.c(2):   0x9803
0.189543 PTP2/ptp2/library.c(2):   0x9804
0.189556 PTP2/ptp2/library.c(2):   0x9805
0.189739 PTP2/ptp2/library.c(2):   0x91c0
0.189758 PTP2/ptp2/library.c(2):   0x91c1
0.189771 PTP2/ptp2/library.c(2):   0x91c2
0.189783 PTP2/ptp2/library.c(2):   0x91c3
0.189796 PTP2/ptp2/library.c(2):   0x91c4
0.189808 PTP2/ptp2/library.c(2):   0x91c5
0.189820 PTP2/ptp2/library.c(2):   0x91c6
0.189833 PTP2/ptp2/library.c(2):   0x91c7
0.189845 PTP2/ptp2/library.c(2):   0x91c8
0.189857 PTP2/ptp2/library.c(2):   0x91c9
0.189870 PTP2/ptp2/library.c(2):   0x91ca
0.189882 PTP2/ptp2/library.c(2):   0x91cb
0.189894 PTP2/ptp2/library.c(2):   0x91cc
0.189906 PTP2/ptp2/library.c(2):   0x91ce
0.189919 PTP2/ptp2/library.c(2):   0x91cf
0.189931 PTP2/ptp2/library.c(2):   0x91e1
0.189943 PTP2/ptp2/library.c(2):   0x91e2
0.189956 PTP2/ptp2/library.c(2):   0x91e3
0.189968 PTP2/ptp2/library.c(2):   0x91e4
0.189980 PTP2/ptp2/library.c(2):   0x91e5
0.189992 PTP2/ptp2/library.c(2):   0x91e6
0.190004 PTP2/ptp2/library.c(2):   0x91e7
0.190017 PTP2/ptp2/library.c(2):   0x91e8
0.190029 PTP2/ptp2/library.c(2):   0x91e9
0.190041 PTP2/ptp2/library.c(2):   0x91ea
0.190054 PTP2/ptp2/library.c(2):   0x91eb
0.190066 PTP2/ptp2/library.c(2):   0x91ec
0.190078 PTP2/ptp2/library.c(2):   0x91ed
0.190091 PTP2/ptp2/library.c(2):   0x91f2
0.190103 PTP2/ptp2/library.c(2):   0x91f3
0.190115 PTP2/ptp2/library.c(2):   0x91f4
0.190128 PTP2/ptp2/library.c(2):   0x91f7
0.190140 PTP2/ptp2/library.c(2):   0x9122
0.190165 PTP2/ptp2/library.c(2):   0x9123
0.190177 PTP2/ptp2/library.c(2):   0x9124
0.190190 PTP2/ptp2/library.c(2):   0x91f5
0.190202 PTP2/ptp2/library.c(2):   0x91f6
0.190214 PTP2/ptp2/library.c(2):   0x9052
0.190227 PTP2/ptp2/library.c(2):   0x9053
0.190239 PTP2/ptp2/library.c(2):   0x9057
0.190251 PTP2/ptp2/library.c(2):   0x9058
0.190264 PTP2/ptp2/library.c(2):   0x9059
0.190276 PTP2/ptp2/library.c(2):   0x905a
0.190287 PTP2/ptp2/library.c(2): Events Supported:
0.190300 PTP2/ptp2/library.c(2):   0x4009
0.190312 PTP2/ptp2/library.c(2):   0x4004
0.190325 PTP2/ptp2/library.c(2):   0x4005
0.190337 PTP2/ptp2/library.c(2):   0x4003
0.190349 PTP2/ptp2/library.c(2):   0x4002
0.190361 PTP2/ptp2/library.c(2):   0x4007
0.190374 PTP2/ptp2/library.c(2):   0xc101
0.190386 PTP2/ptp2/library.c(2): Device Properties Supported:
0.190398 PTP2/ptp2/library.c(2):   0xd402
0.190411 PTP2/ptp2/library.c(2):   0xd407
0.190423 PTP2/ptp2/library.c(2):   0xd406
0.190444 gphoto2-port(2): Writing 16=0x10 byte(s) to port...
0.190465 gphoto2-port(3): Hexdump of 16 = 0x10 bytes follows:
0000  10 00 00 00 01 00 14 91-02 00 00 00 01 00 00 00  ................

0.190535 ptp2/ptp_usb_getresp(2): reading response
0.190551 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.190573 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.190588 libusb1(2): reading with timeout 20000
0.193391 libusb1(2): ret = 0
0.193414 gphoto2-port(2): Could only read 12 out of 1024 byte(s)
0.193436 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 03 00 01 20-02 00 00 00              ....... ....    

0.193461 gphoto2-port(2): Writing 12=0xc byte(s) to port...
0.193482 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 01 00 04 10-03 00 00 00              ............    

0.193604 ptp2/ptp_usb_getdata(2): reading data
0.193620 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.193641 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.193656 libusb1(2): reading with timeout 20000
0.194741 libusb1(2): ret = 0
0.194763 gphoto2-port(2): Could only read 24 out of 1024 byte(s)
0.194785 gphoto2-port(3): Hexdump of 24 = 0x18 bytes follows:
0000  18 00 00 00 02 00 04 10-03 00 00 00 02 00 00 00  ................
0010  01 00 01 00 00 00 03 00-                         ........        

0.194801 ptp2/ptp_usb_getresp(2): reading response
0.194814 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.194835 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.194849 libusb1(2): reading with timeout 20000
0.195477 libusb1(2): ret = 0
0.195500 gphoto2-port(2): Could only read 12 out of 1024 byte(s)
0.195522 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 03 00 01 20-03 00 00 00              ....... ....    

0.195539 ptp_list_folder(2): (storage=0x00010001, handle=0xffffffff)
0.195555 ptp(2): ptp_object_want: querying handle 0?

0.195569 ptp2/eos_directory(2): reading handle 00010001 directory of 0x00000000
0.195590 gphoto2-port(2): Writing 24=0x18 byte(s) to port...
0.195610 gphoto2-port(3): Hexdump of 24 = 0x18 bytes follows:
0000  18 00 00 00 01 00 09 91-04 00 00 00 01 00 01 00  ................
0010  ff ff ff ff 00 00 10 00-                         ........        

0.195676 ptp2/ptp_usb_getdata(2): reading data
0.195692 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.195713 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.195727 libusb1(2): reading with timeout 20000
0.200146 libusb1(2): ret = 0
0.200171 gphoto2-port(2): Could only read 128 out of 1024 byte(s)
0.200195 gphoto2-port(3): Hexdump of 128 = 0x80 bytes follows:
0000  80 00 00 00 02 00 09 91-04 00 00 00 02 00 00 00  ................
0010  38 00 00 00 00 00 00 50-01 00 01 00 01 30 00 00  8......P.....0..
0020  01 00 00 00 11 00 00 00-00 00 00 00 00 00 00 40  ...............@
0030  00 00 00 50 44 43 49 4d-00 00 00 00 00 00 00 00  ...PDCIM........
0040  00 00 00 00 3c 6b f9 5a-38 00 00 00 00 00 08 60  ....<k.Z8......`
0050  01 00 01 00 01 30 00 00-01 00 00 00 11 00 00 00  .....0..........
0060  00 00 00 00 00 00 00 40-00 00 08 60 4d 49 53 43  .......@...`MISC
0070  00 00 00 00 00 00 00 00-00 00 00 00 3c 6b f9 5a  ............<k.Z

0.200225 ptp2/ptp_usb_getresp(2): reading response
0.200239 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.200259 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.200273 libusb1(2): reading with timeout 20000
0.201481 libusb1(2): ret = 0
0.201504 gphoto2-port(2): Could only read 16 out of 1024 byte(s)
0.201526 gphoto2-port(3): Hexdump of 16 = 0x10 bytes follows:
0000  10 00 00 00 03 00 01 20-04 00 00 00 00 00 00 00  ....... ........

0.201544 ptp_list_folder_eos(2): adding new objectid 0x50000000 (nrofobs=0,j=0)
0.201560 PTP2/ptp2/library.c(2): ObjectInfo for 'DCIM':
0.201573 PTP2/ptp2/library.c(2):   Object ID: 0x50000000
0.201586 PTP2/ptp2/library.c(2):   StorageID: 0x00010001
0.201598 PTP2/ptp2/library.c(2):   ObjectFormat: 0x3001
0.201611 PTP2/ptp2/library.c(2):   ProtectionStatus: 0x0000
0.201624 PTP2/ptp2/library.c(2):   ObjectCompressedSize: 0
0.201637 PTP2/ptp2/library.c(2):   ThumbFormat: 0x0000
0.201649 PTP2/ptp2/library.c(2):   ThumbCompressedSize: 0
0.201662 PTP2/ptp2/library.c(2):   ThumbPixWidth: 0
0.201674 PTP2/ptp2/library.c(2):   ThumbPixHeight: 0
0.201686 PTP2/ptp2/library.c(2):   ImagePixWidth: 0
0.201699 PTP2/ptp2/library.c(2):   ImagePixHeight: 0
0.201711 PTP2/ptp2/library.c(2):   ImageBitDepth: 0
0.201724 PTP2/ptp2/library.c(2):   ParentObject: 0x00000000
0.201737 PTP2/ptp2/library.c(2):   AssociationType: 0x0000
0.201749 PTP2/ptp2/library.c(2):   AssociationDesc: 0x00000000
0.201762 PTP2/ptp2/library.c(2):   SequenceNumber: 0x00000000
0.201775 PTP2/ptp2/library.c(2):   ModificationDate: 0x5af96b3c
0.201788 PTP2/ptp2/library.c(2):   CaptureDate: 0x5af96b3c
0.201802 ptp_list_folder_eos(2): adding new objectid 0x60080000 (nrofobs=1,j=1)
0.201817 PTP2/ptp2/library.c(2): ObjectInfo for 'MISC':
0.201830 PTP2/ptp2/library.c(2):   Object ID: 0x60080000
0.201843 PTP2/ptp2/library.c(2):   StorageID: 0x00010001
0.201856 PTP2/ptp2/library.c(2):   ObjectFormat: 0x3001
0.201869 PTP2/ptp2/library.c(2):   ProtectionStatus: 0x0000
0.201881 PTP2/ptp2/library.c(2):   ObjectCompressedSize: 0
0.201894 PTP2/ptp2/library.c(2):   ThumbFormat: 0x0000
0.201906 PTP2/ptp2/library.c(2):   ThumbCompressedSize: 0
0.201919 PTP2/ptp2/library.c(2):   ThumbPixWidth: 0
0.201931 PTP2/ptp2/library.c(2):   ThumbPixHeight: 0
0.201943 PTP2/ptp2/library.c(2):   ImagePixWidth: 0
0.201956 PTP2/ptp2/library.c(2):   ImagePixHeight: 0
0.201968 PTP2/ptp2/library.c(2):   ImageBitDepth: 0
0.201980 PTP2/ptp2/library.c(2):   ParentObject: 0x00000000
0.201993 PTP2/ptp2/library.c(2):   AssociationType: 0x0000
0.202006 PTP2/ptp2/library.c(2):   AssociationDesc: 0x00000000
0.202018 PTP2/ptp2/library.c(2):   SequenceNumber: 0x00000000
0.202031 PTP2/ptp2/library.c(2):   ModificationDate: 0x5af96b3c
0.202044 PTP2/ptp2/library.c(2):   CaptureDate: 0x5af96b3c
0.202064 ptp(2): ptp_object_want: querying handle 0?

0.202085 gphoto2-filesystem(2): Listing files in /
0.202101 gphoto2-filesystem(2): Lookup folder '/'...
0.202114 gphoto2-filesystem(2): Found! / is 0x6e2b18
0.202127 gphoto2-filesystem(2): Querying folder /...
0.202140 gphoto2-filesystem(2): Delete all files in folder 0x6e2b18//
0.202153 ptp2(2): file_list_func(/)
0.202239 gphoto2-camera(2): Listing folders in '/'...
0.202257 gphoto2-filesystem(2): Listing folders in /
0.202271 gphoto2-filesystem(2): Lookup folder '/'...
0.202285 gphoto2-filesystem(2): Found! / is 0x6e2b18
0.202297 gphoto2-filesystem(2): ... is dirty, getting from camera
0.202311 ptp2(2): folder_list_func(/)
0.202331 gphoto2-port(2): Writing 12=0xc byte(s) to port...
0.202352 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 01 00 04 10-05 00 00 00              ............    

0.202431 ptp2/ptp_usb_getdata(2): reading data
0.202447 ptp2/ptp_usb_getpacket(2): getting next ptp packet
0.202469 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.202483 libusb1(2): reading with timeout 20000
0.202954 libusb1(2): ret = -1
0.202969 ptp2/usbread(2): Clearing halt on IN EP and retrying once.
0.202992 gphoto2-port(2): Clear halt...
0.203161 gphoto2-port(2): Reading 1024=0x400 bytes from port...
0.203177 libusb1(2): reading with timeout 20000
0.203294 libusb1(2): ret = -1
0.203309 ptp2/usbread(2): Clearing halt on IN EP and retrying once.
0.203328 gphoto2-port(2): Clear halt...
0.203446 ptp2/usb_getdata(2): request code 0x1004 getting data error 0x02ff
0.203480 context(0): PTP I/O error
0.203588 gphoto2-camera(2): Operation failed!
0.204912 gp-camera(2): Freeing camera...
0.204946 gphoto2-camera(2): Exiting camera ('Canon EOS 50D')...
0.204974 gphoto2-port(2): Writing 12=0xc byte(s) to port...
0.204996 gphoto2-port(3): Hexdump of 12 = 0xc bytes follows:
0000  0c 00 00 00 01 00 03 10-06 00 00 00              ............    

0.205175 ptp2/usb_sendreq(2): request code 0x1003 sending req result -35
0.205221 gphoto2-port(2): Closing port...
0.205629 gphoto2-filesystem(2): resetting filesystem
0.205647 libgphoto2/gphoto2-filesys.c(2): Clearing fscache LRU list...
0.205662 libgphoto2/gphoto2-filesys.c(2): fscache LRU list already empty
0.205677 gphoto2-filesystem(2): Internally deleting all folders from '/'...
0.205691 gphoto2-filesystem(2): Lookup folder '/'...
0.205705 gphoto2-filesystem(2): Found! / is 0x6e2b18
0.205719 gphoto2-filesystem(2): Recurse delete folder 0x6e2b18//
0.205739 gphoto2-port(2): Freeing port...
0.205758 gphoto2-port(2): Closing port...
0.206086 gphoto2-filesystem(2): resetting filesystem
0.206103 libgphoto2/gphoto2-filesys.c(2): Clearing fscache LRU list...
0.206118 libgphoto2/gphoto2-filesys.c(2): fscache LRU list already empty
0.206132 gphoto2-filesystem(2): Internally deleting all folders from '/'...
0.206146 gphoto2-filesystem(2): Lookup folder '/'...
0.206159 gphoto2-filesystem(2): Found! / is 0x6e2b18
0.206172 gphoto2-filesystem(2): Recurse delete folder 0x6e2b18//
------------------------------------------------------------------------------
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