On Sun, 29 May 2011 20:49:05 +0000
Alan Mackenzie <a...@muc.de> wrote:

> Having played a CD, I discover there's no way to eject it; the physical
> button on the drive is inactive until I exit from Gnome, which is
> clearly suboptimal.

Try checking to see if any program has a file open in the cd.
If you open a terminal and change the current dir to one on the cd, it will 
lock it as well as a open file.
I had fun and games with that ones.

If all else fails you could turn the lock off with: echo 0 > 
/proc/sys/dev/cdrom/lock 
I'm sure you know that you can add the setting to /etc/sysctl.conf

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