My Genius VideoCAM GE111 did not work out of the box on Mandriva 2008.1; here's how I got it working. …
On my next distro, Mandriva 2010.2, the webcam worked out of the box. These notes remain for reference purposes.
Webcam is a CIF Single Chip from Pixart Imaging, ID 093a:2471, badged as Genius VideoCAM GE111.
With the webcam plugged in to a USB port, install the cam driver dkms-gspcav1. The kernel sources will be pulled in as a dependency, so don't be surprised by the large download.
Reboot to load the kernel module. The cam should now be detected and working in applications that use it (Kopete, Ekiga, etc.).
Optionally, install webcam control software. I chose wxcam. It was not in Mandriva's regular repositories; it was found at http://rpmlinux.org/mandriva/2008.1/i586/media/main/release/. Requires revel (also at rpmlinux.org). Video works well. Sound not working, but I suspect this to be a soundcard or mixer problem, not a wxcam problem. Using Xvid, produces soundless avi file at 8 MB/min; this may increase once audio is working. Currently records at 3.5 FPS; web searches suggest 15 FPS may be possible and will give good playback.