well.... at a glance I got this solution handy only -
but be aware: it is meant for Ubuntu - it should also work on debian (hopefully)
You can give it a try - or at least it makes you understand which step is neccessary...
usually I don't give away untested advises, but this time I had no time for a deeper checkout
this time this is a trial on Elive /Debian:
How2 iSight problem on Intel Mac :
mount existing Mac partition and go to:
(Your mounted OS X Volume)/System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBVideoSupport.kext/Contents/MacOS/AppleUSBVideoSupport
Then install the firmware extractor and let it do the work for you:
sudo apt-get install isight-firmware-tools
If the path is incorrect, you will NOT ! be prompted for another location.
You must purge the installation and redo before trying again.
sudo apt-get --purge remove isight-firmware-tools
sudo apt-get install isight-firmware-tools
After success, SHUT DOWN and then boot fresh.
Test with cheese;
sudo apt-get install cheese
If not succeed, check:
MactelSupportTeam/AppleiSight - Community Help Wiki
__