[Ltsp-discuss] Audio CD issues - LTSP Edubuntu 14.04.1 64-bit

[Jakub Stoppa]

I have a new install of Edubuntu 14.04.1 64-bit running on an ESXi 5.5 U1
host. We opted to run the GNOME fallback interface since we run a number
of low spec PCs with 1 to 2 GB RAM with iterated Intel graphics (i815 and
i845).

On the ThinClients I am able play back un-encrypted DVDs, access DATA CDs
and DVDs. All external media automatically mounts, even my external USB
sticks and HDDs. The only thing that is not working are Audio CDs.

I tested with a minimal base install of Edubuntu 14.04.1 without applying
any updates. I also tested with Edubuntu fully patched and still get the
same result -- Audio CDs just dont play or even mount

I've searched the forums/mailing lists and the net for a simple working
solution but am unable to find a working fix.

There is no issue with the system actually seeing media in the DVD drive
since all other media I throw at it works. It's just Audio CDs that do not
work properly. I cant play them with VLC, MPlayer... etc at all. K3b and
Brasero do not see the Audio CD either.

Also, on the this client, for some further troubleshooting, I dropped
switched to a terminal session (Ctrl-AltF1), logged in as root (after
unlocking chroot user and setting password) and ran this command

dmesg | more

then I insert an Audio CD into the thin client. Here is the dmesg output I
get


[ 564.489596] Read(10): 28 00 00 03 51 f1 00 00 01 00
[ 564.489642] UDF-fs: error (device sr0): udf_read_tagged: read failed,
block=178532, location=178532
[ 564.494035] sr 0:0:0:0: [sr0]
[ 564.494039] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 564.494044] sr 0:0:0:0: [sr0]
[ 564.494047] Sense Key : Illegal Request [current]
[ 564.494052] ILI
[ 564.494056] sr 0:0:0:0: [sr0]
[ 564.494061] Add. Sense: Illegal mode for this track


.....



and further on


[ 564.537466] ILI
[ 564.537470] sr 0:0:0:0: [sr0]
[ 564.537475] Add. Sense: Illegal mode for this track
[ 564.537480] sr 0:0:0:0: [sr0] CDB:
[ 564.537488] Read(10): 28 00 00 00 02 70 00 00 01 00
[ 564.537527] UDF-fs: error (device sr0): udf_read_tagged: read failed,
block=512, location=512
[ 564.539391] UDF-fs: warning (device sr0): udf_load_vrs: No anchor found
[ 564.539394] UDF-fs: warning (device sr0): udf_fill_super: No partition
found (1)


I've attached the the dmesg output for reference.

Any help on this would really be appreciated.

Thanks

[Jakub Stoppa]

Sorry for the previous post. Attached my error log and looks like it came
up at the front of the email. My first time asking for help here.

I have a new install of Edubuntu 14.04.1 64-bit running on an ESXi 5.5 U1
host. We opted to run the GNOME fallback interface since we run a number
of low spec PCs with 1 to 2 GB RAM with iterated Intel graphics (i815 and
i845).

On the ThinClients I am able play back un-encrypted DVDs, access DATA CDs
and DVDs. All external media automatically mounts, even my external USB
sticks and HDDs. The only thing that is not working are Audio CDs.

I tested with a minimal base install of Edubuntu 14.04.1 without applying
any updates. I also tested with Edubuntu fully patched and still get the
same result -- Audio CDs just dont play or even mount

I've searched the forums/mailing lists and the net for a simple working
solution but am unable to find a working fix.

There is no issue with the system actually seeing media in the DVD drive
since all other media I throw at it works. It's just Audio CDs that do not
work properly. I cant play them with VLC, MPlayer... etc at all. K3b and
Brasero do not see the Audio CD either.

Also, on the this client, for some further troubleshooting, I dropped
switched to a terminal session (Ctrl-AltF1), logged in as root (after
unlocking chroot user and setting password) and ran this command

dmesg | more

then I insert an Audio CD into the thin client. Here is the dmesg output I
get


[ 564.489596] Read(10): 28 00 00 03 51 f1 00 00 01 00
[ 564.489642] UDF-fs: error (device sr0): udf_read_tagged: read failed,
block=178532, location=178532
[ 564.494035] sr 0:0:0:0: [sr0]
[ 564.494039] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 564.494044] sr 0:0:0:0: [sr0]
[ 564.494047] Sense Key : Illegal Request [current]
[ 564.494052] ILI
[ 564.494056] sr 0:0:0:0: [sr0]
[ 564.494061] Add. Sense: Illegal mode for this track


.....



and further on


[ 564.537466] ILI
[ 564.537470] sr 0:0:0:0: [sr0]
[ 564.537475] Add. Sense: Illegal mode for this track
[ 564.537480] sr 0:0:0:0: [sr0] CDB:
[ 564.537488] Read(10): 28 00 00 00 02 70 00 00 01 00
[ 564.537527] UDF-fs: error (device sr0): udf_read_tagged: read failed,
block=512, location=512
[ 564.539391] UDF-fs: warning (device sr0): udf_load_vrs: No anchor found
[ 564.539394] UDF-fs: warning (device sr0): udf_fill_super: No partition
found (1)


I've attached the the dmesg output for reference. (in my previous email)

Any help on this would really be appreciated.

Thanks

[Vagrant Cascadian]

Post by Jakub Stoppa
I have a new install of Edubuntu 14.04.1 64-bit running on an ESXi 5.5 U1
host. We opted to run the GNOME fallback interface since we run a number
of low spec PCs with 1 to 2 GB RAM with iterated Intel graphics (i815 and
i845).
On the ThinClients I am able play back un-encrypted DVDs, access DATA CDs
and DVDs. All external media automatically mounts, even my external USB
sticks and HDDs. The only thing that is not working are Audio CDs.

Audio CDs don't implement a mountable filesystem...

You could work around this issue by running the Audio CD playing
application as an LTSP localapp.


Long ago there was a standalone kernel module, maybe called "cdfs-src",
but I don't think it's been maintained in recent years:

http://linux.about.com/cs/linux101/g/cdfssrc.htm

Another more difficult option would be to write a fuse filesystem that
dynamically transforms audio CDs into .wav files, much like how
"cdfs-src" did it, but probably a little more maintainable.


live well,
vagrant