My CD/DVD drives is locked when disc inserted

yars · 05-14-2013, 01:42 AM

Hi to all!
I have a problem with locking my CD/DVD drives.

Code:

# sdparm --get LOCK /dev/sr{0,1}
    /dev/sr0: TOSHIBA   CD/DVDW SDR5372V  TU11  [cd/dvd]
LOCK        1  [cha: n, def:  1]
    /dev/sr1: LG        CD-ROM CRD-8522B  1.02  [cd/dvd]
LOCK        1  [cha: n, def:  1]
# cat /etc/sysctl.conf 
dev.cdrom.lock=0
dev.cdrom.autoclose=0
# sysctl -q dev.cdrom.lock
dev.cdrom.lock = 0

My question is why the sysctl parameters isn't applied? Thanks.

UPD: When I try to change it with sdparm, I get:

Code:

# sdparm --clear=LOCK /dev/sr{0,1}
    /dev/sr0: TOSHIBA   CD/DVDW SDR5372V  TU11  [cd/dvd]
change_mode_page: page offset failed: given response length too small, offset=8 given_len=8 bd_len=0

    /dev/sr1: LG        CD-ROM CRD-8522B  1.02  [cd/dvd]
change_mode_page: failed setting page: CD/DVD (MM) capabilities and mechanical status (MMC)

UPD2: I cannot eject disks from drives by button on drive...

rkelsen · 05-14-2013, 06:41 PM

Is udev running?

gdizzle · 05-14-2013, 06:44 PM

After you placed the entried in:

Code:

/etc/sysctl.conf

Did you do a try a:

Code:

sysctl -p

To reload the entries in /etc/sysctl.conf?

I understand you cannot eject disks by button, however does it eject when you use the command:

Code:

eject

yars · 05-14-2013, 11:56 PM

Quote:

Originally Posted by rkelsen

Is udev running?

Yes, and it works fine. I'm can't find out the udev rule that enable, disable or override the sysctl settings.

Quote:

To reload the entries in /etc/sysctl.conf?

Yes, entries in sysctl.conf is applied, but does not work. For experience, I try:

Code:

# cat -A /etc/sysctl.conf
dev.cdrom.lock=0$
$
# sysctl -p
dev.cdrom.lock = 0
#  cat /proc/sys/dev/cdrom/lock 
0

Quote:

however does it eject when you use the command

Yes, I know and so far doing so...

torimus · 05-15-2013, 03:46 AM

Probably a stupid question, but does not some app automount drive after a disc is inserted ?
Can you see anything related in an output of mount command ?

GazL · 05-16-2013, 08:42 AM

It's udev: lib/udev/rules.d/60-cdrom_id.rules

Code:

# media eject button pressed
ENV{DISK_EJECT_REQUEST}=="?*", RUN+="cdrom_id --eject-media $devnode", GOTO="cdrom_end"

# import device and media properties and lock tray to
# enable the receiving of media eject button events
IMPORT{program}="cdrom_id --lock-media $devnode"

I comment both of those out on my systems, but doing so mgiht stop the removable-volume management features of the desktop environment from working with cdroms: I use an autofs mapping for removable media, so this side-effect doesn't bother me.

yars · 05-16-2013, 10:14 AM

GazL, thanks you, I need to continue to be careful. I was looking through this rule, but did not notice anything similar to the one shown you. Also thanks to all for answers. The problem is solved:

Code:

# cp /lib/udev/rules.d/60-cdrom_id.rules /etc/udev/rules.d/60-cdrom_id.rules
# sed 's/IMPORT/#
IMPORT/' /etc/udev/
rules.d/60-cdrom_id.rules
#kill -HUP $(pidof `which udevd`)

GazL · 05-16-2013, 10:17 AM

Quote:

Originally Posted by yars

I was looking through this rule, but did not notice anything similar to the one shown you

Ah, yes. I often forget that I'm running 'current'. Sorry about that.

yars · 12-19-2013, 10:39 AM

Hi all again. I decided to go back to this problem again. Removing in the /etc/udev/rules.d/60-cdrom_id.rules from line

Code:

IMPORT{program}="cdrom_id --lock-media $devnode"

the "--lock-media" parameter makes able to eject the media when it is mounted, so it is not a good solution. I tried to number experiences with udev, but cannot get the DISK_EJECT_REQUEST event. I have enabled the in-kernel-polling by placing into a /etc/udev/rules.d/60-persistent-storage.rules line

Code:

  # enable in-kernel media-presence polling
  ACTION=="add", SUBSYSTEM=="module", KERNEL=="block", ATTR{parameters/events_dfl_poll_msecs}=="0", ATTR{parameters/events_dfl_poll_msecs}="2000"
+ ACTION=="add", ATTR{removable}=="1", ATTR{events_poll_msecs}=="-1", ATTR{events_poll_msecs}="2000"

that is disabled by default. And that is works same as when in-kernel-polling is disabled: when disc is inserted, but not mounted, I can eject a disc by pressing the button on a drive, when disc is mounted, drive is locked, and events from that button is not received. /sys/block/sr0/events contains:

Code:

cat /sys/block/sr0/events
media_change eject_request

Why this contain a two records? Any ideas? Thanks again.