Re: discover not finding CDROM

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To: debian-user@lists.debian.org
Date: Mon, 25 Apr 2005 19:02:02 -0400

Apparently, _Paul Yeatman_, on 04/25/2005 02:00 PM,typed:

> Hello and thanks!

Hi. You are welcome.

> Answers to your questions...
>
>
>>If you could answer a few questions, we might narrow down where your
>>problem really is:
>>1) What are the relevant contents of /etc/fstab that you have?
>
>
> /dev/cdrom0 /media/cdrom0 iso9660 ro,user,noauto 0 0
> /dev/cdrom1 /media/cdrom1 iso9660 ro,user,noauto 0 0
>

Okay, honestly, I am not at all sure about these cdrom? things. In my
computer running Sarge, I have made /media/cdrw and /media/cdrom and put
these in my /etc/fstab and they are working fine. I did notice however
that after installation of Sarge, I ended up with /cdrom0 and /cdrom1
(IIRC) mount points. Never figured out what they were supposed to do.

>>2) What are the mount points that you use to access /dev/hdc and /dev/hdd?
>
>
> I believe this is indicated in the answer to the first question unless I"m not understanding your question.

Just wanted to make sure mount points exist and are correct.

>>3) Are you in the 'cdrom' group?
>
>
> Yes!

You must be for this to work (belonging to the 'disk' group is not
recommended as I found out here). Secondly, if you want automounting of
usb sticks and the like to work, you also need to be in plugdev group
unless I am really mistaken but I am sure somebody more knowledgable
here can confirm this.

>>4) What are the permissions of /dev/hdc and /dev/hdd?
>
>
> brw-rw---- 1 root disk 22, 0 Apr 29 2004 /dev/hdc
> brw-rw---- 1 root disk 22, 64 Apr 29 2004 /dev/hdd
>
> Ah, so this is interesting. Under kernel 2.4, I was using scsi
> emulation for the IDE cdrom devices. Thus the /dev/scd? entries are in
> group 'cdrom'. /dev/hd[cd], currently, are not, however. This seems
> it should be changed. I would anticipate that 'discover' would do this
> auto"magically" if it found the cdrom devices yet, as already stated,
> it does not.

The permissions here need to be root:cdrom. I also had to change them
manually after installation of Sarge.

>>5) What are the contents of /media?
>
>
> # ls /media/
> cdrom floppy floppy0 sophos_server
>
> I put the "sophos_server" mount point here. All others I believe
> were part of the Gnome or otherwise installation. There are no
> cdrom[01] mount point directories here (as there used to be under
> kernel 2.4) yet this seems to be a symptom of the fact that 'discover'
> does not find the devices. I can manually create such directories but
> this doesn't seem to solve anything (and such manual entries may be
> getting deleted upon each reboot by 'discover').
>
> I deleted these directories before doing the 'ls' to show what was
> there before beginning to futz around (and upon first boot into
> 2.6).

I think discover for some reason puts cdrom? into / and you end up with
/cdrom0 and /cdrom1. But if yo go ahead and put these in /media,
everything should work.

>>6) Do you have hal, hotplug, dbus-1, gnome-volume-manager installed?
>>What versions?
>
>
> # dpkg -l hal hotplug dbus-1 gnome-volume-manager
> Desired=Unknown/Install/Remove/Purge/Hold
> | Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
> |/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
> ||/ Name Version Description
> +++-==============-==============-============================================
> pn hal <none> (no description available)
> ii hotplug 0.0.20040329-2 Linux Hotplug Scripts
> ii dbus-1 0.23.4-1 simple interprocess messaging system
> pn gnome-volume-m <none> (no description available)
>
>
>
> Hmmm, it seems gnome-volume-manager would be responsible for mounting
> the CD's upon insertion although apparently not installed. Even with
> it "purged" I have the preference configuration GUI to specify whether
> to have inserted CD's mounted or not. If gnome-volume-manager was
> recentinly uninstalled for some reason, this would explain things
> although I'm not convinced it was ever installed.
>
> Thanks, again.
>
> Just a note that things were working fine and as desired under kernel
> 2.4, ie. everything seemed to be in place . . . I was in cdrom group,
> correct entries were in fstab, mount points existed, things were
> automounting (by Gnome not autofs). Going to 2.6, scsi emulation of
> IDE cdrom devices doesn't seem to be the same (not available...? ...at
> least not by 2.6.8) so that is a change as well as 'discover' no longer
> finding the cdrom devices itself.

Discover should still find the drives, wonder why it doesn't -- maybe
becuase you are missing hal. Only that now they are /dev/hd[cd]. Anyway:
Change permissions of /dev/hd[cd] to root:cdrom.
Make the mount pionts that you want in /media (even in / will do).
Try inserting a CD. It should work.
If it doesn't, install gnome-volume-manger. If it does, still install
gnome-volume-manger and add yourself to plugdev group if you also want
automounting and icons-on-desktop for any USB disk that you may plug in.

GL,
->HS

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