From: Henrik.Carlqvist@deadspam.com   
      
   On Sat, 19 Feb 2022 14:46:57 +0000, Clark Smith wrote:   
      
   > I have several 14.2 systems, and none of them seems to be able to detect   
   > DVDs. That is, when I insert a DVD in the DVD unit, I can see nothng   
   > whatsoever in /var/log/syslog, /var/log/messages, or dmesg in those   
   > systems.   
      
   > Do you guys have any suggestions how to try and diagnose (and fix) this   
   > problem?   
      
   I would start to check if the system is aware that it has a DVD reader.   
   In the output from dmesg, you should see the DVD reader being detected at   
   boot. If it was a long time since last reboot, those old line might be   
   lost from the dmesg command but can still be found in /var/log/dmesg. You   
   should find lines looking something like this:   
      
   [    3.432517] scsi 0:0:0:0: CD-ROM            ASUS     BW-16D1HT   
   3.00 PQ: 0 ANSI: 5   
   [    3.457515] sr 0:0:0:0: [sr0] scsi3-mmc drive: 48x/48x writer dvd-ram   
   cd/rw xa/form2 cdda tray   
   [    3.457686] cdrom: Uniform CD-ROM driver Revision: 3.20   
   [    3.457818] sr 0:0:0:0: Attached scsi CD-ROM sr0   
      
   Another way to see if your system is aware of your DVD reader is to study   
   the content of /proc/scsi/scsi , on my system it looks like this:   
      
   cat /proc/scsi/scsi   
   Attached devices:   
   Host: scsi0 Channel: 00 Id: 00 Lun: 00   
     Vendor: ASUS     Model: BW-16D1HT        Rev: 3.00   
     Type:   CD-ROM                           ANSI  SCSI revision: 05   
   Host: scsi1 Channel: 00 Id: 00 Lun: 00   
     Vendor: ATA      Model: ST1000DM010-2EP1 Rev: CC43   
     Type:   Direct-Access                    ANSI  SCSI revision: 05   
      
   If your system is aware of your DVD reader I would double check that the   
   DVDs you insert are really supported. Maybe your are trying to put a DVD   
   disc in a CDROM reader? Maybe your DVD discs are dual layer and your   
   drive only supports single layer? Maybe you are putting a DVD+R disc in a   
   reader which only supports DVD-R?   
      
   If your system does not know anything about your DVD reader I would check   
   that the SATA cable is connected between the DVD reader and the   
   motherboard. I would also reboot to enter CMOS setup to check that your   
   motherboard is aware of the DVD reader and that the SATA channel hasn't   
   been disabled in CMOS setup.   
      
   I also have several 14.2 systems and they are all able to detect CDROM,   
   DVD and some of them BluRay. Depending on configuration the users will   
   also be able to mount such discs, usually the machines have the following   
   line in /etc/fstab:   
      
   /dev/cdrom   /mnt/cdrom   auto   noauto,user,ro,comment=x-gvfs-show 0   0   
      
   However, even without users being able to mount the discs you should be   
   able to se information about the disc in the output from the command   
   dmesg. Did you configure your own custom kernel? To be able to use CDROM   
   and DVD you will need CONFIG_BLK_DEV_SR.   
      
   regards Henrik   
      
   --- SoupGate-Win32 v1.05   
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