No /dev/sr0 in stretch upgrade from jessie

hilltownboy · 11-19-2017, 02:33 PM

There is no /dev/sr0 in my stretch upgrade from jessie, so I can't use cdroms. Trying to load module sr_mod, I reach the following dead end:

Code:

    ~$ sudo modprobe 4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko
    modprobe: FATAL: Module 4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko not found in directory /lib/modules/4.9.0-3-686-pae

Code:

    $ sudo ls -l /lib/modules/kernel/drivers/scsi/sr_mod.ko
    ls: cannot access '/lib/modules/kernel/drivers/scsi/sr_mod.ko': No such file or directory

Yet the following shows that sr_mod.ko is there:

Code:

    name@debian:/lib/modules/4.9.0-3-686-pae/kernel/drivers/scsi$ ll sr_mod.ko
    -rw-r--r-- 1 root root 25148 Aug  6 00:24 sr_mod.ko

Also:

Code:

    ~$ sudo modinfo sr_mod
    filename:       /lib/modules/4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko
    license:        GPL
    alias:          scsi:t-0x04*
    alias:          scsi:t-0x05*
    alias:          block-major-11-*
    license:        GPL
    description:    SCSI cdrom (sr) driver
    depends:        scsi_mod,cdrom
    intree:         Y
    vermagic:       4.9.0-3-686-pae SMP mod_unload modversions 686
    parm:           xa_test:int

Would appreciate help.

hilltownboy

ondoho · 11-19-2017, 03:06 PM

so the problem is you cannot access your cd/dvd player?
have you tried to autodetect with e.g. vlc? maybe the path has changed?

ferrari · 11-19-2017, 03:13 PM

Anything enumerated by the following?

Code:

lsscsi

Code:

lsblk

Code:

ls -l /dev/dvd

hilltownboy · 11-20-2017, 02:20 PM

ondoho, yes, the problem is I can't access the cdrom. There is no /dev/sr0. However I just accessed a cd using Arch linux and an external USB cd drive. The Arch does not have a /dev/sr0 either, so some other driver must be in play.
I don't know what is meant by "autodetect with e. g. vlc".

ferrari: nothing enumerated except hard disk partitions by lsblk

ferrari · 11-20-2017, 02:31 PM

Quote:

ferrari: nothing enumerated except hard disk partitions by lsblk

Then I suggest the hardware concerned is dead (or not connected perhaps).

ferrari · 11-20-2017, 02:34 PM

For reference, I get

Code:

~> lsscsi
[0:0:0:0]    disk    ATA      HARDDISK    1.0   /dev/sda 
[2:0:0:0]    cd/dvd  VBOX     CD-ROM           1.0   /dev/sr0 
~> lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0 14.7G  0 disk 
├─sda1   8:1    0    2G  0 part [SWAP]
└─sda2   8:2    0 12.7G  0 part /
sr0     11:0    1 1024M  0 rom
~> ls -l /dev/dvd
lrwxrwxrwx 1 root root 3 Nov 18 12:56 /dev/dvd -> sr0

ondoho · 11-21-2017, 01:03 AM

Quote:

Originally Posted by hilltownboy

I don't know what is meant by "autodetect with e. g. vlc".

vlc is a versatile gui media player.
it is capable of detecting & playing optical disks.

AwesomeMachine · 11-21-2017, 01:18 AM

Try booting with a disk in the drive and see if sr0 or dvd shows up in dev.

mrmazda · 11-21-2017, 01:54 AM

This was a new Stretch AMD64 installation in June 2016:

Code:

# cat /etc/debian_version
9.2
# lsscsi
[4:0:0:0]    disk    ATA      HITACHI HDS72505 AB0A  /dev/sda 
[6:0:0:0]    cd/dvd  TSSTcorp CDDVDW SH-224DB  SB01  /dev/sr0 
# lsblk | grep rom
sr0      11:0    1  1024M  0 rom  
# ls -l /dev/dvd
lrwxrwxrwx 1 root root 3 Nov 21 01:37 /dev/dvd -> sr0
# lsmod | grep sr
sr_mod                 24576  0
cdrom                  61440  1 sr_mod
scsi_mod              225280  4 sd_mod,libata,sr_mod,sg

I get essentially the same results on a 32 bit Stretch that is an upgrade from a Jessie originally installed April 2015.

hilltownboy · 11-21-2017, 06:55 PM

lsscsi was not installed. I installed it and it showed only one line:

Code:

[2:0:0:0]    disk    ATA      Hitachi HTS54161 C7BP  /dev/sda

mrmazda · 11-21-2017, 07:08 PM

Any chance your DVD drive is on a PATA bus instead of SATA, and needs its jumper matched to the cable type connected to it (cable select vs. master or slave)?

hilltownboy · 11-22-2017, 08:41 AM

Things work mechanically because I just booted gparted on a CD-R and transferred a screenshot to my home directory. For this I had to set my ancient BIOS to boot from CD first.
I cannot mount CDs. There is no /dev/sr0. Isn't /dev/sr0 needed to mount CDs? Or is something different under systemd?

ferrari · 11-22-2017, 12:07 PM

Going back to your first post, run the modprobe command like this

Code:

sudo modprobe sr_mod

then check

Code:

lsmod|grep sr

Code:

ls -l /dev/sr*

mrmazda · 11-22-2017, 01:26 PM

Quote:

Originally Posted by hilltownboy

Things work mechanically because I just booted gparted on a CD-R....

Not all kernels behave the same when a PATA jumper is incorrectly set. Maybe 3.16 or whatever kernel that GParted media uses is more forgiving than 4.9.

AwesomeMachine · 11-22-2017, 11:34 PM

See #8