Problem are your CD-ROM drives/kernel; HELP NEEDED

Martin Pitt martin.pitt at
Tue Sep 21 22:49:47 UTC 2004

Hi Søren, hi Warthogs!

(The funny subject is for catching the attention of the other

On 2004-09-17 15:06 +0200, Søren Hauberg wrote:
> Volume Management not Supported
> The "hald" service is required but not currently running. Enable the
> service and rerun this applet, or contact your system administrator.

I spent some time debugging this on your box. Thanks for letting me
onto it.

Conlusion: this is really not hal's fault, something is wrong with
your CD-ROM drives /dev/hdc and /dev/hdd. Every process that tries to
open it hangs (e. g. 'cat /dev/hdd').

If I issue this command at my box, I get:

$ cat /dev/hdc
cat: /dev/hdc: No medium found

which is what it should be like. hal just tries to 

    fd = open (device_file, O_RDONLY | O_NONBLOCK);

(device_file is "/dev/hdd"), which causes the process to hang. Above
cat command can reproduce it more easily.

To play around a little, you can try to insert a valid CD in both
drives and see if cat'ing them works then. Then hal should run as

Can you mount your CD-ROMs? If that works, then only the empty drive
case is faulty at your box. But honestly I've got no idea what could
be the cause of it.

Can you please file a bug report with all information you can get
about this?

Wartys, any idea to that?


Martin Pitt             
Ubuntu Developer  
Debian GNU/Linux Developer
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