DVD Not Recognized

[mainak_sen]

I have recently installed Lucid on an Acer Aspire 5570Z laptop. It has an Optiarc DVD RW AD-7530A DVD-RAM writer. I am having trouble in playing video/movies on DVD.

When I am inserting a movie DVD, the drive is working (i.e. is busy) continuously but the disc is not being recognized and mounted. Disc Utility is showing "No Media Detected".
The same DVD discs are playing OK in my desktop (running Hardy) and on another laptop (running Lucid).

Please note, however, that Audio and data CDs are playing/reading OK in the same drive. Even blank DVDs are being recognized and mounted OK.

I shall greatly appreciate if someone can help. Thanks in advance!

===========

*-cdrom
description: DVD-RAM writer
product: DVD RW AD-7530A
vendor: Optiarc
physical id: 1
bus info: scsi@1:0.0.0
logical name: /dev/cdrom
logical name: /dev/cdrw
logical name: /dev/dvd
logical name: /dev/dvdrw
logical name: /dev/scd0
logical name: /dev/sr0
version: EX31
capabilities: removable audio cd-r cd-rw dvd dvd-r dvd-ram
configuration: ansiversion=5 status=busy

[lidex]

I recently ran into a similar issue when the disc had played just fine in a previous ubuntu release. Was a region setting.
Try installing this:

sudo apt-get install regionset

I set it to 0 and the disc plays now. Haven't tried much since, but no errors.
Reference:
http://ubuntuforums.org/showthread.php?t=930164