cd drive lock does not work after oneiric upgrade

Because the eject button on my laptop's CD drive is highly susceptible to being pressed accidentally, I use "eject -i 1" to lock the CD drive from being ejected when the button is pressed.

After upgrading to oneiric, this stopped working. stracing eject shows that it is correctly finding the /dev/sr0 node, opening it, and ioctl'ing it correctly, but if I press the eject button afterwards, the drive still ejects.

access("/dev/cdrom", F_OK) = 0
readlink("/dev/cdrom", "sr0", 4095) = 3
lstat("/dev", {st_mode=S_IFDIR|0755, st_size=4280, ...}) = 0
lstat("/dev/sr0", {st_mode=S_IFBLK|0660, st_rdev=makedev(11, 0), ...}) = 0
readlink("/dev/sr0", 0x7fff9b7355e8, 4095) = -1 EINVAL (Invalid argument)
stat("/dev/sr0", {st_mode=S_IFBLK|0660, st_rdev=makedev(11, 0), ...}) = 0
open("/etc/mtab", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc535d19000
read(3, "rootfs / rootfs rw 0 0\nsysfs /sy"..., 1024) = 1020
stat("rootfs", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("sysfs", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("proc", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("udev", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("devpts", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("tmpfs", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("fusectl", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("/dev/disk/by-uuid/328dbf84-b767-4ad8-bd64-4a34b08d3c23", {st_mode=S_IFBLK|0660, st_rdev=makedev(8, 1), ...}) = 0
stat("none", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("none", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("none", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("none", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("none", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("binfmt_misc", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
stat("gvfs-fuse-daemon", 0x7fff9b738900) = -1 ENOENT (No such file or directory)
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7fc535d19000, 4096) = 0
open("/etc/fstab", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=671, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc535d19000
read(3, "# /etc/fstab: static file system"..., 4096) = 671
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7fc535d19000, 4096) = 0
stat("/dev/sr0", {st_mode=S_IFBLK|0660, st_rdev=makedev(11, 0), ...}) = 0
geteuid() = 1000
open("/dev/sr0", O_RDWR|O_NONBLOCK) = 3
ioctl(3, CDROM_LOCKDOOR, 0x1) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc535d19000
write(1, "CD-Drive may NOT be ejected with"..., 47CD-Drive may NOT be ejected with device button
) = 47
exit_group(0) = ?

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: linux-image-3.0.0-11-generic 3.0.0-11.18
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
AplayDevices:
 **** List of PLAYBACK Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: PCH [HDA Intel PCH], device 0: CONEXANT Analog [CONEXANT Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: evan 2036 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'PCH'/'HDA Intel PCH at 0xd2620000 irq 47'
   Mixer name : 'Conexant CX20590'
   Components : 'HDA:14f1506e,17aa21ce,00100000'
   Controls : 8
   Simple ctrls : 5
Card29.Amixer.info:
 Card hw:29 'ThinkPadEC'/'ThinkPad Console Audio Control at EC reg 0x30, fw unknown'
   Mixer name : 'ThinkPad EC (unknown)'
   Components : ''
   Controls : 1
   Simple ctrls : 1
Card29.Amixer.values:
 Simple mixer control 'Console',0
   Capabilities: pswitch pswitch-joined penum
   Playback channels: Mono
   Mono: Playback [off]
CheckboxSubmission: d27dbc9ce66475289526ca4b283ec487
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
Date: Tue Sep 20 08:50:04 2011
HibernationDevice: RESUME=UUID=9322ffe7-f8c0-4ca1-a8f6-b972b86dd64a
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LENOVO 41786VU
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=328dbf84-b767-4ad8-bd64-4a34b08d3c23 ro quiet splash disable_ipv6=1 vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.0.0-11-generic N/A
 linux-backports-modules-3.0.0-11-generic N/A
 linux-firmware 1.60
SourcePackage: linux
StagingDrivers: mei
UpgradeStatus: Upgraded to oneiric on 2011-09-18 (2 days ago)
dmi.bios.date: 03/31/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET53WW (1.23 )
dmi.board.asset.tag: Not Available
dmi.board.name: 41786VU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr83ET53WW(1.23):bd03/31/2011:svnLENOVO:pn41786VU:pvrThinkPadT420:rvnLENOVO:rn41786VU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 41786VU
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO