[solved] Can't mount dvds

[rsala]

I've been trying to get my dvd player working. Its been working fine as a cdplayer. I've finally got it working (I think by unplugging the other dvd player) but only when I'm logged in as root. It still doesn't work as a normal user. My groups settings are:

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groups root
cdrom cdrw root

and

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groups roger
disk wheel floppy audio cdrom video cdrw usb users wireshark roger

Any ideas? Also you can see I borked up my root groups screwing around with things. Can somebody point me to a resource that will show me what groups root should belong to?

[carcajou]

Maybe you should add your user to plugdev group.

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#gpasswd -a roger plugdev

On my system:

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$ groups root
root bin daemon sys adm disk wheel floppy dialout tape video

[rsala]

Thanks for the timely help kukibl! At least I got my root groups fixed. The dvd is not working at all anymore under root or otherwise. I put in a dvd which did not automount and then got this in my dmesg:

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[  962.380513] sr 1:0:0:0: [sr0] Unhandled sense code
[  962.380518] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  962.380523] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current] 
[  962.380531] Info fld=0x84
[  962.380534] sr 1:0:0:0: [sr0] Add. Sense: No seek complete
[  962.380540] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 00 00 84 00 00 08 00
[  962.380554] end_request: I/O error, dev sr0, sector 528
[  962.380560] Buffer I/O error on device sr0, logical block 132
[  962.380566] Buffer I/O error on device sr0, logical block 133
[  962.380573] Buffer I/O error on device sr0, logical block 134
[  962.380578] Buffer I/O error on device sr0, logical block 135
[  962.380583] Buffer I/O error on device sr0, logical block 136
[  962.380587] Buffer I/O error on device sr0, logical block 137
[  962.380590] Buffer I/O error on device sr0, logical block 138
[  962.380594] Buffer I/O error on device sr0, logical block 139
[  974.795944] sr 1:0:0:0: [sr0] Unhandled sense code
[  974.795949] sr 1:0:0:0: [sr0] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[  974.795954] sr 1:0:0:0: [sr0] Sense Key : Medium Error [current] 
[  974.795961] Info fld=0x5d910
[  974.795964] sr 1:0:0:0: [sr0] Add. Sense: No seek complete
[  974.795971] sr 1:0:0:0: [sr0] CDB: Read(10): 28 00 00 05 d9 10 00 00 02 00
[  974.795985] end_request: I/O error, dev sr0, sector 1532992
[  974.795991] Buffer I/O error on device sr0, logical block 383248
[  974.795999] Buffer I/O error on device sr0, logical block 383249
[  976.950567] UDF-fs: Partition marked readonly; forcing readonly mount
[  977.128031] UDF-fs INFO UDF: Mounting volume 'UDF Volume', timestamp 2008/07/30 20:00 (1f10)
[ 1105.730703] UDF-fs: Partition marked readonly; forcing readonly mount
[ 1105.742682] UDF-fs INFO UDF: Mounting volume 'UDF Volume', timestamp 2008/07/30 20:00 (1f10)

Anybody know what this might mean?

[NeddySeagoon]

rsala,

Most video DVDS are made with a corrupt filesystem as a way of deterring casual users from making copies.
Do not mount a video to play it - all the video players use raw device access, so you need to be in the cdrom group, which you are.

Run

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mplayer dvd://1

and see what happens. That plays title 1 on the dvd, which might only be a single frame. So try other titles too. You can add in

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-dvd-device <path to device>

if you have several dvd devices.

mplayer error messages will help diagnose problems for other players ... in that respect, its a very good diagnostic tool.

[rsala]

I went out and bought a new dvd player. The (very) old one was just acting a little too flaky. Now life is good running as root and I'm back to not being able to run as a normal user. When I run the mplayer command it plays just fine. But when I try to play it through Totem I get a popup that says ...

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Totem was not able to play this disc.
Not Authorized

dmesg displays the following:

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[ 1406.144941] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1406.144948] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[ 1406.144955] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 1406.144966] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 32 00 00 08 00
[ 1406.144980] end_request: I/O error, dev sr1, sector 16117960
[ 1406.144986] __ratelimit: 3 callbacks suppressed
[ 1406.144990] Buffer I/O error on device sr1, logical block 2014745
[ 1406.145028] Buffer I/O error on device sr1, logical block 2014746
[ 1406.145035] Buffer I/O error on device sr1, logical block 2014747
[ 1406.145041] Buffer I/O error on device sr1, logical block 2014748
[ 1406.184898] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1406.184909] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[ 1406.184919] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 1406.184933] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 32 00 00 02 00
[ 1406.184955] end_request: I/O error, dev sr1, sector 16117960
[ 1406.184963] Buffer I/O error on device sr1, logical block 2014745
[ 1406.328578] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 1406.328585] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[ 1406.328592] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[ 1406.328602] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 34 00 00 02 00
[ 1406.328617] end_request: I/O error, dev sr1, sector 16117968
[ 1406.328622] Buffer I/O error on device sr1, logical block 2014746

[rsala]

I can access the dvd through mplayer and brasero but not totem and not through the Places item on the Gnome menu. Here are the groups I'm a member of:

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disk lp wheel floppy audio cdrom video cdrw usb users plugdev wireshark roger

I'm really at a loss. Could this be some kind of Pam issue?

[NeddySeagoon]

rsala,

totem should not try to mount the dvd you want to play. I think it uses xine-libs (from memory).
Do you have hald and dbus running ?

Can you mount burned data DVDs ?

[rsala]

Thanks for the help. This one really has me stumped.

Hald and dbus are both running. I understand that playing a dvd is not "mounting" it per se but when I'm logged into a gnome session as root I see an icon on the desktop with the movie title on it. If I click on it I can see a folder. If I right click it, it gives me the option to play it with totem.

When I insert a data dvd as a normal user I get a pop up that says :

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Unable to mount UDF Volume
Not Authorized

It also won't mount a data cd but it will play a music cd with Rythmbox.

[NeddySeagoon]

rsala,

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Unable to mount UDF Volume
Not Authorized 

means that you don't have auto mounting set up. It should still work manually.

Audio CDs do not have a filesystem and cannot be mounted.

[rsala]

Here's what happens when I try it from the command line as a normal user:

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mount /dev/sr1 /mnt/cdrom/
mount: only root can do that

[VoidMage]

Here's what happens when I try it from the command line as a normal user:

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mount /dev/sr1 /mnt/cdrom/
mount: only root can do that

That's very surprising - really, in such case, that's what should be printed.

Your real problem lies probably on consolekit/policykit line.
Depending on Gnome version, see if either devkit-disks or udisks works from command line.

[NeddySeagoon]

rsala,

When you use the full form of mount, such as

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mount /dev/sr1 /mnt/cdrom/ 

then fstab is not consulted, so

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mount: only root can do that 

is the expected answer.

If your /etc/fstab contains the user or users option for /dev/sr1, then either

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mount /dev/sr1

or

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mount /mnt/cdrom/ 

will work as you force mount to consult /etc/fstab to determine where to mount, or what to mount respectively and the options are applied as you expect.

[monsm]

Here's what happens when I try it from the command line as a normal user:
Your real problem lies probably on consolekit/policykit line.
Depending on Gnome version, see if either devkit-disks or udisks works from command line.

I think this might be your problem. If you are on xorg-server 1.6.5 or later hal has very little to do with it. I haven't needed to check the policykit in detail, but I think it has some "allow access" type config files somewhere under /etc. You'll probbaly find it with some searches around policykit.

Mons

[rsala]

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devkit-disks --mount /dev/sr1
Mount failed: Not Authorized

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udisks
-bash: udisks: command not found

[rsala]

I had commented out the line in my fstab according to other advice I had read online. Now it looks like this:

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/dev/sr1		/mnt/cdrom	auto		noauto,ro	0 0

and now ...

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devkit-disks --mount /dev/sr1           
Mount failed: Error mounting: mount exited with exit code 1: helper failed with:
mount: only root can mount /dev/sr1 on /mnt/cdrom

[NeddySeagoon]

rsala,

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/dev/sr1      /mnt/cdrom   auto      user,noauto,ro   0 0

would be better.

The user option allows any user to mount /dev/sr1 on /mnt/cdrom provided you use the lazy form of mount.
However, only the user that performed the mount can umount the volume.

The users (not the s on the end) is similar, except any user can perform the umount.

If you set up auto mouting, you do not need the line in /etc/fstab.

[VoidMage]

Actually, no. A line in fstab, while doesn't stop automount altogether, as in case of hal,
still interferes with normal devkit-disks/udisks method of working.

Remove the line and check the output again.

The "Not authorized" line is more correct, as we go back to the real problem - policykit/consolekit.

Also, IIRC, plugdev mattered for hal only.

[rsala]

The /dev/sr1 line is commented out in my fstab and here is the rc-update output:

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rc-update show
           alsasound | boot                          
            bootmisc | boot                          
             checkfs | boot                          
           checkroot | boot                          
               clock | boot                          
         consolefont | boot                          
          consolekit |      default                  
               cupsd |      default                  
                dbus |      default                  
                hald |      default                  
            hostname | boot                          
             keymaps | boot                          
               local |      default nonetwork        
          localmount | boot                          
             modules | boot                          
            net.eth0 |      default                  
              net.lo | boot                          
            netmount |      default                  
          ntp-client |      default                  
                ntpd |      default                  
           rmnologin | boot                          
               samba |      default                  
                sshd |      default                  
           syslog-ng |      default                  
      udev-postmount |      default                  
             urandom | boot                          
          vixie-cron |      default

Here is the output from dmesg with a dvd in the drive before specifically attempting to do anything:

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[   36.630903] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[   36.630910] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[   36.630917] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[   36.630928] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 32 00 00 08 00
[   36.630942] end_request: I/O error, dev sr1, sector 16117960
[   36.630947] Buffer I/O error on device sr1, logical block 2014745
[   36.630953] Buffer I/O error on device sr1, logical block 2014746
[   36.630958] Buffer I/O error on device sr1, logical block 2014747
[   36.630963] Buffer I/O error on device sr1, logical block 2014748
[   36.678033] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[   36.678039] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[   36.678045] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[   36.678055] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 32 00 00 02 00
[   36.678068] end_request: I/O error, dev sr1, sector 16117960
[   36.678072] Buffer I/O error on device sr1, logical block 2014745
[   36.878665] sr 2:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[   36.878672] sr 2:0:0:0: [sr1] Sense Key : Illegal Request [current] 
[   36.878678] sr 2:0:0:0: [sr1] Add. Sense: Read of scrambled sector without authentication
[   36.878687] sr 2:0:0:0: [sr1] CDB: Read(10): 28 00 00 3d 7c 34 00 00 02 00
[   36.878701] end_request: I/O error, dev sr1, sector 16117968
[   36.878705] Buffer I/O error on device sr1, logical block 2014746

If I click on "Places" on the gnome menu it shows a disk with the name of the dvd on it but there's no icon on the desktop like when I'm logged on as root. If I click on the icon in the "Places" sub-menu I get the pop-up that says "Unable to mount ..." "Not Authorized."

If I launch Totem it gives me an option under the Movie menu to play the disk, but if I select it, I get another pop-up that says "Totem was not able to play this disc." "Not Authorized".

If I then launch Brasero and select "Disk Copy" ... it works!

[VoidMage]

What does 'ls -l /dev/sr1' print ?
Same for ck-list-sessions (while in X).
See polkit manpage and pkaction.

[rsala]

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ls -l /dev/sr1
brw-rw---- 1 root cdrom 11, 1 Jun 30 18:32 /dev/sr1

ck-list-sessions (while in X) doesn't return anything.

I did take a look at the man pages but it looks like quite an investment in time to learn that infrastructure just to get my cd player to work without superuser privileges. As the people on this thread are saying it would be nice if there was a source of information for troubleshooting if this stuff isn't going to work right-out-of-the-box.

http://forums.gentoo.org/viewtopic-t-8 ... ght-.html

[VoidMage]

ck-list-sessions (while in X) doesn't return anything.

That's the important part.
Now, a question arises: how exactly do you run X ?

[rsala]

startx

[VoidMage]

Any custom .xinitrc/.xsession/other tweaks ?

[rsala]

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more .xinitrc 
export XDG_MENU_PREFIX=gnome-
exec gnome-session

no .xsession

[VoidMage]

Make that 'exec ck-launch-session gnome-session'