can not eject DVD drive

Binary package hint: eject

I had a DVD+RW inserted that I unmounted and mounted several times (as bug data collection for another bug).

After that right clicked the DVD icon in Places/Computer as selected to blank it.

Then I tried to burn an iso image to it, but brasero complained there is no space in the blank DVD...

So I decided to do the old trick of eject-and-reinsert, but I can't eject it.
The hardware eject button has no effect.
In the GUI, the context menu has no Eject item.

cmd line gives:
$ sudo eject -v /dev/sr0
eject: device name is `/dev/sr0'
eject: expanded name is `/dev/sr0'
eject: `/dev/sr0' is not mounted
eject: `/dev/sr0' is not a mount point
eject: `/dev/sr0' is not a multipartition device
eject: trying to eject `/dev/sr0' using CD-ROM eject command
eject: CD-ROM eject command failed
eject: trying to eject `/dev/sr0' using SCSI commands
eject: SCSI eject succeeded

But is does not eject.

The drive is:
 ata5.00: ATAPI: TSSTcorpCD/DVDW TS-L632D, HH15, max MWDMA2

ProblemType: Bug
Architecture: amd64
Date: Sat Nov 28 00:28:55 2009
DistroRelease: Ubuntu 9.10
LiveMediaBuild: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Package: eject 2.1.5+deb1+cvs20081104-6
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: eject
Uname: Linux 2.6.31-14-generic x86_64