Well it looked as if automounting of DVD/CDs was broken on my system. Digging into the problem, looking at .xsession-errors, I noticed that messages were being spewed out about the 'pmount' command not working. Searching around for pmount I find:ls -l /usr/bin/pmount mythtv@ubuntu:~$ ls -l /usr/bin/pmount -rwsr-xr-- 1 root plugdev 23704 Apr 5 02:38 /usr/bin/pmount
Checking my mythtv groups setting:mythtv@ubuntu:~$ groups mythtv cdrom audio video
D'oh! My user isn't part of the plugdev group. Adding this group fixes automount again :)
DVB channels under MythTV - nightmare stuff when you're not 100% sure what's going on... more later.
Managed to get a DVD drive playing DVDs under xine:
1) Installed the DVD drive as a slave of my main CD burner
2) Boot into ubuntu, confirm the drive is detected correctly:May 22 10:37:45 localhost kernel: hdd: ATAPI 32X DVD-ROM CD-R/RW drive, 2048kB Cache
3) Install the de-css software as outlined here (step 8)
4) Make a mount point for the dvd drive:mkdir /media/dvd0 ln -s /media/dvd0 /media/dvd
5) Add an entry to /etc/fstab for the drive:/dev/hdd /media/dvd0 iso9660 ro,user,noauto 0 0
6) Install xine-uisudo apt-get install xine-ui
7) Change the dvd read location to /dev/dvd (you'll need to change the settings level to 'expert')
8) Pop in a DVD and click the 'DVD' button on the xine gui!