次のコマンドで saa7134.o (あるいは saa7134.ko)などが見付かれば、お使いのLinuxはドライバを有しています。
$ /sbin/modprobe -l | grep saa
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7185.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7134/saa7134.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7134/saa6752hs.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7114.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7111.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa7110.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa5249.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/video/saa5246a.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/common/saa7146_vv.ko
/lib/modules/2.6.8-2-386/kernel/drivers/media/common/saa7146.ko