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alex.blackbit Advocate
Joined: 26 Jul 2005 Posts: 2397
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Posted: Sun Feb 03, 2013 5:34 pm Post subject: no /dev/dvd, but /dev/cdrom exists |
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Hi,
I don't need my cdrom drive very often so I don't know how long this problem already exists.
It's best described by console output: Code: | $ cat /etc/udev/rules.d/70-persistent-cd.rules
# This file was automatically generated by the /lib64/udev/write_cd_rules
# program, probably run by the cd-aliases-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single line
# and set the $GENERATED variable.
# HL-DT-ST_DVDRAM_GSA-U20N (pci-0000:00:1f.2-scsi-0:0:0:0)
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="cdrom", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="cdrw", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="dvd", ENV{GENERATED}="1"
SUBSYSTEM=="block", ENV{ID_CDROM}=="?*", ENV{ID_PATH}=="pci-0000:00:1f.2-scsi-0:0:0:0", SYMLINK+="dvdrw", ENV{GENERATED}="1"
$ ls -l /dev/{cdrom,cdrw,dvd,dvdrw,sr*}
ls: cannot access /dev/cdrw: No such file or directory
ls: cannot access /dev/dvd: No such file or directory
ls: cannot access /dev/dvdrw: No such file or directory
lrwxrwxrwx 1 root root 3 Feb 3 18:15 /dev/cdrom -> sr0
brw-rw---- 1 root cdrom 11, 0 Feb 3 18:15 /dev/sr0
$ |
Is there any obvious reason for that?
Thanks in advance. |
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VoidMage Watchman
Joined: 14 Oct 2006 Posts: 6196
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Posted: Sun Feb 03, 2013 8:33 pm Post subject: |
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udev has stopped generating those rules, so the chances are the ones present are out of date.
But a single /dev/cdrom symlink should be present. |
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alex.blackbit Advocate
Joined: 26 Jul 2005 Posts: 2397
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Posted: Sun Feb 03, 2013 8:52 pm Post subject: |
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VoidMage wrote: | udev has stopped generating those rules, so the chances are the ones present are out of date. |
What should that mean? Maybe udev does not generate these rules now, but they _are_ present on my system.
The syntax of the rules did not change afaik.
I do not understand why the rules in this file do not have any effect.
Do you have an explanation?
VoidMage wrote: | But a single /dev/cdrom symlink should be present. |
Yes, as I already wrote. |
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SamuliSuominen Retired Dev
Joined: 30 Sep 2005 Posts: 2133 Location: Finland
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Posted: Sun Feb 03, 2013 9:11 pm Post subject: |
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alex.blackbit wrote: | I do not understand why the rules in this file do not have any effect. |
The way /dev/cdrom is created also changed; the old persistent cd rules are not supposed to work anymore as the whole ATA transport class is skipped in that part of udev code. |
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alex.blackbit Advocate
Joined: 26 Jul 2005 Posts: 2397
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Posted: Sun Feb 03, 2013 11:57 pm Post subject: |
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Thanks for your answer, ssuominen.
I assume that my rules file is a leftover.
Maybe an udev update in the past instructed me to delete it and i overlooked that, I am not sure.
Since these symlinks are handy for various things, I would like to have them back.
Is there any easy way to achieve this?
Also, how do I find out which of my rules under /etc/udev/rules.d are obsolete?
I have these: Code: | -rw-r--r-- 1 root root 807 May 1 2012 70-persistent-cd.rules
-rw-r--r-- 1 root root 633 May 16 2012 70-persistent-net.rules
-rw-r--r-- 1 root root 1.7K Jan 14 22:30 80-net-name-slot.rules |
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Gusar Advocate
Joined: 09 Apr 2005 Posts: 2665 Location: Slovenia
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Posted: Mon Feb 04, 2013 1:06 am Post subject: |
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Code: | udevadm info --query=property --name=/dev/sr0 |
That will show you the attributes you can use. Your outdated rules file probably uses an attribute that doesn't exist anymore. The simplest rule if you only have a single optical drive is Code: | SUBSYSTEMS=="scsi", KERNEL=="sr0", SYMLINK+="cdrom dvd" |
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wcg Guru
Joined: 06 Jan 2009 Posts: 588
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Posted: Tue Feb 05, 2013 9:52 pm Post subject: |
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I find this handy:
In /etc/mplayer/mplayer.conf:
Code: |
# Use the kernel's device name.
cdrom-device=/dev/sr0
dvd-device=/dev/sr0
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Then I can play an audio cd with mplayer with
regardless of what udev does with aliases of /dev/sr0.
Adjust your other software that hardcodes device pathnames
to aliases of /dev/sr0 like /dev/cdrom, /dev/dvd, etc, to actually
use /dev/sr0, and a lot of problems go away. _________________ TIA |
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