My camera is Canon Powershot S50 and my distro is Fedora 2. I have searched it in Linux HCL and see that it is compatible. But when I access it via Digital Camera Tool, it announces that:

I'm a new user in Linux, so I don't understand much about this error. Can you give me some advices to solve this problem?

Thank you for reading. I'm happy to join a great forum like this.

Unfortunatly, I don't know what that error is either, but try the following suggestions which may help...

Try doing it as root.

Do you have any other USB devices, and do they work?

Is the camera set up as a "USB Mass Storage" device? This should be a setting somewhere in the camera itself. Then you can plug the camera in and, from a terminal, try mounting it...
make a directory called /mnt/usb (You need to be root) and then "mount /dev/sda1 /mnt/usb" When you are finished, dont forget to "umount /mnt/usb".

I hope this helps
--Ian

Following your advice I did something:

I tried to mount it as a USB Mass Storage but it is not valid, so my camera may not be a USB Storage. Before I accessed the camera (and even before I loged in), I have pluged out all other USB devices but still get the same error. Also I tried as root.

Thank you for your nice help, but unfortunately it is not like we wish.

Anyone help me please! Now I must reboot to Win whenever I want to download my pictures.

As root issue tail -f /var/log/messages.
Then plug in your camera and look at the messages there should be some reference to hotplug I think.
Now try cdrecord -scanbus it should return your cd/dvd writer and cd/dvd rom AND also the device which your camera is. mkdir /mnt/camera and mount the device to the directory.
The above worked for me, hope it helps.

I have the same camera (canon s50) and i cant plug it here. When it is plugged it turns on and the image is displayed on the camera... not like it happens in win2k. My /var/log/messages is:

when i plug it...
Dec 8 18:42:27 ademonozu kernel: hub.c: new USB device 00:03.0-3, assigned address 5
Dec 8 18:42:27 ademonozu kernel: usb.c: USB device 5 (vend/prod 0x4a9/0x3077) is not claimed by any active driver.
Dec 8 18:42:31 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:42:31 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:42:31 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:42:31 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:42:32 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:42:32 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:42:32 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:42:32 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:42:33 ademonozu devlabel: devlabel service started/restarted

when i unplug it...
Dec 8 18:43:16 ademonozu kernel: usb.c: USB disconnect on device 00:03.0-3 address 5
Dec 8 18:43:16 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:43:16 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:43:16 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:43:16 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:43:17 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:43:17 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:43:17 ademonozu kernel: Device 08:00 not ready.
Dec 8 18:43:17 ademonozu kernel: I/O error: dev 08:00, sector 0
Dec 8 18:43:19 ademonozu devlabel: devlabel service started/restarted

can anyone tell me what this means? I have a working lexar jumpdrive that i mount on /dev/sda1 and i am using the same port for my camera...

thank you all.

gPhoto2 lists the S50 as a supported device. read thru the docs there - its pretty easy to get running.

http://www.gphoto.org/proj/libgphoto2/support.php

Canon S400 works perfectly with gphoto2, I haven't tried with S50.

Thanks again. It is VERY easy. I just need to "apt-cache search gphoto2" and then get many other options... i installed them all and decided to try the GUI... so just:

gtkam

at the terminal and then the rest was piece of cake. Thank you all... now i just need to get my pinnacle usb tuner working...