How can I disable the button of my CD/DVD drive?
Solution 1
Thanks to @Affix's answer which gave me the right direction to head, I've figured out the solution to the problem.
The problem is definitely caused by UDEV as you've guessed. The issue is this line that is in most UDEV files related to the cdrom drive.
Example
On Fedora 19 there is the following file, /usr/lib/udev/rules.d/60-cdrom_id.rules
. In this file is the following line which is co-opting the eject button for CD/DVD devices.
ENV{DISK_EJECT_REQUEST}=="?*", RUN+="cdrom_id --eject-media $devnode", GOTO="cdrom_end"
You can work around the issue and disable UDEV's ability to co-opt the eject button by doing the following:
Make a copy of the file
60-cdrom_id.rules
$ sudo cp /usr/lib/udev/rules.d/60-cdrom_id.rules /etc/udev/rules.d/.
Edit this copied version of the file and comment out the line containing the string,
DISK_EJECT_REQUEST
.$ sudoedit /etc/udev/rules.d/60-cdrom_id.rules
Save the file and the change should be noticeable immediately!
The above solution fixes the problem for both eject
and cdctl
. So now the following commands work as expected:
lock the drive
$ eject -i on /dev/sr0
eject: CD-Drive may NOT be ejected with device button
-or-
$ cdctl -o1
unlock the drive
$ eject -i off /dev/sr0
eject: CD-Drive may be ejected with device button
-or-
$ cdctl -o0
Solution 2
Add the line:
DISC_EJECT_REQUEST
to the CD ROM udev rules. This will enable you to lock with:
eject -i
Related videos on Youtube
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slm
Worked in the tech field for over 20+ years. Started out learning basic on an Apple IIe then on a TRS-80. Been interested in computer hardware and software my entire life. Consider myself lucky that my hobby as a kid/adult is what I get to do everyday earning a living. You can learn more about me here. ============================================================ Stolen from @Mokubai: First, please put down the chocolate-covered banana and step away from the European currency systems. You may consider how to ask a question.
Updated on September 18, 2022Comments
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slm almost 2 years
Up until Fedora 14 I was successfully using
cdctl
to enable/disable the CD/DVD eject button on my laptop (Thinkpad T410). Sadly it has stopped working now.I've consulted the methods discussed in these 2 questions:
- disable cd/dvd button on linux laptop (ubuntu)
- Disable the DVD eject button on a Thinkpad running Linux
None of which have worked for me. So I turn back to
cdctl
to see if we can't fix what's broken with it, since it's worked for so long.Debugging the issue
So starting with
cdctl
switches I notice that most things seem to work just fine.Examples
These things work.
ejects the drive
$ cdctl -e
list capabilities
$ cdctl -k Tray close : 1 Tray open : 1 Can disable eject : 1 Selectable spin speed : 1 Is a jukebox : 0 Is multisession capable: 1 Can read the MCN (UPC) : 1 Can report media change: 1 Can play audio discs : 1 Can do a hard reset : 1 Can report drive status: 1
According to that list
cdctl
even thinks that it can enable/disable the eject button.Can disable eject : 1
So I continue on with debugging the issue.
Debugging cdctl
So I figure lets do an
strace
oncdctl
to see if it can shed some light on what's going on.$ strace cdctl -o1 ... brk(0) = 0x1371000 open("/dev/cdrom", O_RDONLY|O_NONBLOCK) = -1 ENOENT (No such file or directory) open("/dev/cd", O_RDONLY|O_NONBLOCK) = -1 ENOENT (No such file or directory) open("/dev/scd0", O_RDONLY|O_NONBLOCK) = -1 ENOENT (No such file or directory) open("/dev/sr0", O_RDONLY|O_NONBLOCK) = 3 ioctl(3, CDROM_LOCKDOOR, 0x1) = 0 close(3) = 0 exit_group(0) = ? +++ exited with 0 +++
Curiously it seems like
cdctl
thinks it's disabling the button.$ strace cdctl -o1 ioctl(3, CDROM_LOCKDOOR, 0x1) = 0 $ strace cdctl -o0 ioctl(3, CDROM_LOCKDOOR, 0) = 0
NOTE: If I understand this right, the return of a 0 means it was successful.
One thing that caught my eye here was the list of devices that
cdctl
is attempting to interact with. So I thought "what if I try these devices witheject
"?eject command
One of the other commands I used to use years ago was the
eject
command to interact with the CD/DVD device. I noticed that this command also now has a similar named switch:$ eject --help -i, --manualeject <on|off> toggle manual eject protection on/off
Example
$ eject -i 1 /dev/sr0 eject: CD-Drive may NOT be ejected with device button $ eject -i 0 /dev/sr0 eject: CD-Drive may be ejected with device button
So
eject
too thinks that it's disabling the button, yet it isn't either. Usingstrace
here I see the same system calls:$ strace eject -i 1 /dev/sr0 |& grep ioctl ioctl(3, CDROM_LOCKDOOR, 0x1) = 0 $ strace eject -i 0 /dev/sr0 |& grep ioctl ioctl(3, CDROM_LOCKDOOR, 0) = 0
So now I'm wondering if UDEV or something else is potentially blocking or taking ownership of device?
Thoughts?
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Admin over 10 yearsI also have a T410, and often find myself hitting the CD drive eject button when I don't mean to. I'll be interested to see if this gets resolved.
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Admin over 10 yearsIs the button still working when the Disk in that drive is mounted?
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Admin over 10 yearsI feel you pain, I had the same problem: Lock CD/DVD drive (prevent eject). I found no solution and ended up removing the drive physically, since it was too annoying to have the drive pop out a dozen times per day. Good luck…
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Admin over 10 years@Marco - see the answer!
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Admin over 10 years@WhiteHotLoveTiger - see the answer!
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slm over 10 yearsThe line actually needed to be removed, at least in my case on Fedora 19.
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slm over 10 years@Marco - I'm confused what you're asking me, I didn't change the
/lib/
rule. I copied it to/etc/udev/rules.d/
and made my own overriding version. -
slm over 10 years@Marco - NP, there's ample places to get confused and make mistakes 8-)
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underscore_d over 8 yearsThanks for this. Confirmed in current Debian stable (8/Jessie). Commenting out that line instantly removed my ability to, e.g., accidentally eject a Bluray while it's mounted or even playing. Gotta love how
udev
overrides expected behaviour elsewhere in Linux... But now I can let KDE handle deliberate ejection and stop worrying about accidents. -
underscore_d over 8 yearsSame here. Even so: Add it to which file? between which other lines? Is that the entire line? Surely that's not syntactically valid for
udev
? etc. - poor answer.