CD-ROM not auto-detected [SOLVED]

mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland

If I insert a USB, it is detected by the file manager (Thunar) and can be mounted. A CD-ROM and and DVD-ROM are not.

Logicien · Posted: Sat Nov 29, 2014 3:32 am Post subject:

Have-you acticate /Devices Drivers/SCSI devices support/SCSI cdrom support in your kernel config?
Have-you activate /File sytems/CDROM/DVD Filesystems/ISO 9660 CDROM file system support and UDF file system support in your kernel config?
_________________
Paul

eccerr0r · Posted: Sat Nov 29, 2014 4:09 am Post subject:

Definitely check CD/DVD support if you can't detect your drive at all (see dmesg).

Then see if you get an event
$ udevadm monitor

if not, you can try
sudo bash -c 'echo 2000 > /sys/block/sr0/events_poll_msecs'
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mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland

All the kernel options mentioned above are enabled / checked.

After the events_poll_msecs change, on inserting a CD:

eccerr0r · Posted: Sun Nov 30, 2014 1:44 am Post subject:

What are your USE flags on Thunar?
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VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland

eccerr0r · Posted: Sun Nov 30, 2014 3:06 pm Post subject:

Now I have to look at a real machine with Thunar installed as I don't know if Thunar code handles this properly - it needs to listen to dbus that media got inserted and act accordingly. This is slightly different because the *drive* will always exist, but the *media* in the drive may not. For a USB stick the *drive* and the *media* go away together.

It looks like my machine doesn't even behave right with removable media.

Do you have thunar-volman installed? I need to install that to see what next... Unfortunately this is a machine that's I don't tend to use, so not going to be a high priority debug effort...
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mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland

eccerr0r · Posted: Sun Nov 30, 2014 9:05 pm Post subject:

No idea, agreed doesn't make sense why removable drives work but removable media does not... but they do need to be handled differently.
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VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

Looks like everyone missed my point.
It's in '[IDE mode]' - it should be AHCI. Might or might not matter, but it's something to check. Change it in BIOS.

eccerr0r · Posted: Thu Dec 04, 2014 6:52 pm Post subject:

I have old regular IDE CDROM drives that autodetect media with polling, hence I'm not sure AHCI is necessary.

AHCI is great for autodetecting the whole drive however, as regular IDE is NOT made for hotplug.
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VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland

eccerr0r · Posted: Thu Dec 04, 2014 11:50 pm Post subject:

VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

Gosh...
IDE mode of AHCI controller exists pretty much for the sake of Windows XP only, as it was released before those became ubiquitous, so the original install CDs wouldn't work with them. For quite a few years, "AHCI controller in IDE mode" means pretty much "system configured not quite correctly"

I'm not saying that I'm sure the above is behind the problems, but it's something to clean up.

As for those 'incantations', 'udevadm monitor' and 'udisksctl monitor' should cover most of it, though out of curiosity, post 'udevadm info' on the cdrom node to.

Logicien · Posted: Fri Dec 05, 2014 8:14 am Post subject:

In the Preferences of Thunar, Advanced options, there is a check box to allow Thunar to manage volumes with a link to confiugre them. Is it activated?

Is your user is in the cdrom group? If there's a dbus group, it can be a good idea to include a normal user to it.

In /etc/fstab, having a line for the mount of the cdrom with the user or the users option (see man mount) can help to automount cds inserted in the cdrom.

I use autofs who is a good automounter for cds.
_________________
Paul

VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

Logicien · Posted: Fri Dec 05, 2014 9:26 am Post subject:

So VoidMage,

pass to AHCI mode is it what you propose? Is the dbus and udisks flag should be set globally?
_________________
Paul

VoidMage · Watchman Joined: 14 Oct 2006 Posts: 6196

How many times I've got to repeat myself - no, I'm not saying I'm sure switching to AHCI will matter, I just want to make sure we're handling a common, instead of a corner case.

For file managers with udisks backend, it doesn't matter all that much whether it's an usb drive or a cdrom, so that strongly hints the problem lies deeper.
While most common AHCI-controler-in-IDE-mode problems are of a different type, I just want to make sure it's not simply an uncommon one.

That dbus path route is a one to check too, but again, if it works with usb, it seems quite unlikely.

eccerr0r · Posted: Sun Dec 07, 2014 8:12 pm Post subject:

I had forgotten I had xfce installed on my server and this pathway actually works (see how much I actually login onto its console...) - at least it detects USB attached CDROM drive media as I eject and insert as well as media inserted into flash readers. In the idle state upon fresh login and USB cdrom attached I see thunar-volman --device-added /sys/jibberjabber/path/to/sr0 and Thunar running. All these removable medias show up on the desktop.

I found a new thing to help debug:

mounty1 · l33t Joined: 06 Jul 2006 Posts: 934 Location: Queensland