Hello,
Sorry my german is not good 
But i have the sameproblem, no dvd-drive in any linux distro on my xa 2528, no i found a config file for that problem to use with kernel 2.6.29 that should fix it but i have no compiling experience maybe someone here can compile the kernel with that config and upload the kernel somewhere ???
Thanx Mark
ps remove the .txt extension used becaus the forum would except the file