Quelle((http://blog.myfenris.net/?p=377))

i dont know why all this while im not using webcam in linux until last week i try to plug the webcam in my ubuntu. It appear great result because the webcam driver detected by need to do something more to make its working better … now lets start by checking the device detected ..
<code>
gerald@gerald-kubuntu:~$ lsusb
Bus 004 Device 002: ID 05e3:070e Genesys Logic, Inc. X-PRO CR20xA USB 2.0 Internal Card Reader
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 005: ID 0ac8:303b Z-Star Microelectronics Corp. ZC0303 WebCam
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 003: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 001 Device 001: ID 0000:0000
</code>

With this information we can know the Vendor_id=0ac8 and the Product_id=301b . We could also see this using the graphical user interfase usbview. Another thing that we can see is the manufacturer of the chipset Z-Star/Vimicro (that is also used in many other cheap webcams) Among the output of the usbview program, we can see somthing like this Manufacturer: **Vimicro Corp.**
I’m going to summarize the steps I took:
  1) Download and untar the file gspcav120071224.tar.gz:
  wget -c http://mxhaard.free.fr/spca50x/Download/gspcav1-20071224.tar.gz
tar xvfz gspcav1­20071224.tar.gz
  2) Compile and install the driver:
<code>cd gspcav1-20071224 
make clean
 make 
sudo make install</code>
  3) This is the extra step that I had to do:
<code>sudo gedit /etc/modprobe.d/options</code>
and add an option for this driver:
<code>options gspca force_rgb=1
sudo apt-get install camorama</code>
then try to open camorama, if cant open the application,try this:
<code>$sudo lsmod |grep gspca
 gspca 660176 0
 videodev 28160 2 gspca,zc0301
 usbcore 134280 7 gspca,zc0301,usb_storage,libusual,ehci_hcd,uhci_hcd</code>
Remove the zc0301 module:
<code>$sudo modprobe -r zc0301</code>
Insert module gspca back:
<code>$ sudo modprobe gspca</code>
Give a check first:
<code>$ lsmod |grep gspca
 gspca 660176 0
 videodev 28160 1 gspca
 usbcore 134280 6 gspca,usb_storage,libusual,ehci_hcd,uhci_hcd</code>
Let it be more confident:
<code>$ lsmod | grep videodev
 videodev 28160 1 gspca
 v4l1_compat 15236 1 videodev
 v4l2_common 25216 1 videodev</code>
If it still can’t run the camorama :
check the device permission:
<code>$ ls -l /dev/video0
 crw-rw—- 1 root video 81, 0 2008-01-27 08:10 /dev/video0</code>
Device video0 running with user group video,so u should change the permission:
<code>$ sudo chmod 777 /dev/video0
 $ ls -l /dev/video0
 crwxrwxrwx 1 root video 81, 0 2008-01-27 08:10 /dev/video0</code>
@ the easier way is installing the gspca from repo (i forgot to check in repo, gspca is in it):

<code>gerald@thinkbuntu:~$ sudo apt-get install gspca-source</code>
Hope it working for u all because its working for me!!

----


 --- //[[gp@qqq-gmbh.de|Gerald Nasenbrecher]] 2008/07/09 14:12//Still dont work ('Webcam mit Tele-Aufsatz 7x18' from Discount 'Plus')
Now have the solution:

''HY 
 Just a sugestion...try to install Ekiga , aftre that in the setup pannel you will have to choice betwen V4L and V4L2 because i see this V4L2 driver it is loaded and the device is recognized..try thys just to see if it is ok ..and your cam.it work.
 Good lock.''
Quelle((http://ubuntuforums.org/archive/index.php/t-583132.html))