http://en.opensuse.org/SDB:SSD_discard_(trim)_support

Adding the option “discard” to the fstab line for option settings is the trick. This only works with ext4 and xfs file systems

From my existing opensuse 12.1 install:

/dev/disk/by-id/ata-KINGSTON_SNV425S264GB_07TA50002211-part3    /home/  ext4    acl,user_xattr,noatime,discard 1 2