Linux Galaxy

Disappearing Optical Drives

Posted on Mar 19, 2020 by kingbeowulf


One of my Slackware systems has two optical drives: Blu-Ray and DVD: /dev/sr0 and /dev/sr1. In 14.2 as well as current, if neither are used for awhile, some of the udev symlinks to /dev/sr0 disappear. This becomes maddening (as in WTF?) when I'm trying to run my qemu VMs and I get the error:

1qemu-system-x86_64: -cdrom /dev/dvd: Could not open '/dev/dvd': No such file or directory

Taking a peek shows:

1$ ls -l /dev/dv*
2lrwxrwxrwx 1 root root 3 Mar 14 14:32 /dev/dvd1 -> sr1
3lrwxrwxrwx 1 root root 3 Mar 14 14:32 /dev/dvdr1 -> sr1
4lrwxrwxrwx 1 root root 3 Mar 14 14:32 /dev/dvdrw1 -> sr1
5lrwxrwxrwx 1 root root 3 Mar 14 14:32 /dev/dvdwriter1 -> sr1

instead of the expected list:

 1$ ls -l /dev/dv*
 2lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvd -> sr0
 3lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvd0 -> sr0
 4lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvd1 -> sr1
 5lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdr -> sr0
 6lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdr0 -> sr0
 7lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdr1 -> sr1
 8lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdrw -> sr0
 9lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdrw0 -> sr0
10lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdrw1 -> sr1
11lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdwriter -> sr0
12lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdwriter0 -> sr0
13lrwxrwxrwx 1 root root 3 Mar 19 19:00 /dev/dvdwriter1 -> sr1

Rebooting or reloading the udev rules (as root) restores the expected symlinks:

1# udevadm control --reload-rules && udevadm trigger

I suppose I could just tell qemu to look at /dev/sr0, but where's the fun in that?


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