I'm getting no where quickly trying to get the DVD and sound to work on the D630.
There are a lot of posts on different Linux forums describing the DVD problem on similar - but not identical - chipsets. The best I found is here. The advice is to add the parameter all-generic-ide to the "kernel" line in the GRUB bootloader config file /etc/grub.conf:
kernel /vmlinuz-2.6.18-1.2798.fc6 ro root=/dev/VolGroup00/LogVol00 all-generic-ide rhgb quiet
Unfortunately, it doesn't work on the D630.
I have also tried different BIOS options. In the BIOS, under "Onboard Devices","SATA Operation" is set to ACHI (Advanced Host Controller Interface .) The BIOS says the factory default is ATA. Obviously that's not the Dell factory default. If you try to change it you are warned that "SATA Operation must be AHCI when the Flash Cache Module is enabled." Presumably, Dell have enabled the Flash Cache Module to allow the machine to support Vista ReadyDrive. I disabled the Flash Cache and set "SATA Operation" to ATA: Fedora would no longer boot. I did try booting from the Fedora 7 setup DVD (thinking that a reinstall might not be too high a price to pay to get the DVD working) but it was still not recognized - not even with all-generic-ide.
I've had no better luck with the sound card. I have rebuilt the ALSA (Advanced Linux Sound Architecture) driver, library and utilites but it has made no difference.
It is not just a case then, of getting the latest drivers or changing some settings. The brutal fact seems to be that the current builds of the Linux kernel and drivers simply do not fully support the GM965 chipset. I can probably live without the DVD and without any sound for a while until updates are released, which of course they will be. However, this does highlight one of the difficulties of choosing Linux as your OS - especially in a business environment. Businesses tend to have regular hardware refresh cycles; they need to be comfortable that their loadset images are going to work with the hardware they purchase. The dominance of Windows means that hardware vendors support for Linux will at best be an after-thought, or more likely just be left to the Linux community.