[Bug 412527] Re: Cannot mount media in DVD rom drive, Acer Timeline 4810T. Drive is detected, and media only detected if placed in the drive when machine suspended. Even then DVD movies (purchased) are not recognised - error message that media is unknown. Audio cd's sometimes play. When trying to unmount, I am asked for my password - message given that another user mounted the media.

[Elmar Isele]

Hello Xav',

one simple question: Are you root ?? :-)

check if you edit your /etc/default/grub with root permissions.
open a terminal  an execute:

sudo su

Enter your passwort to login as root

then execute:

gedit

Browse to the file, save it again and execute

update-grub

You're welcome !
Elmar

-- 
Cannot mount media in DVD rom drive, Acer Timeline 4810T. Drive is detected, and media only detected if placed in the drive when machine suspended. Even then DVD movies (purchased) are not recognised - error message that media is unknown. Audio cd's sometimes play. When trying to unmount, I am asked for my password - message given that another user mounted the media. 
https://bugs.launchpad.net/bugs/412527
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