lucid: DVDs no longer accessible

[Nigel Ridley]

On 07/22/2010 07:03 PM, Mark Greenwood wrote:
> On Thursday 22 Jul 2010 16:18:28 Brian Wootton wrote:
>> On 22/07/10 01:54, kubuntu-users-request at lists.ubuntu.com wrote:
>>> Re: lucid: DVDs no longer accessible
>> All the previous stuff on this topic sounds very erudite, maybe I'm
>> missing something, but I have had on occasion 3 DVD drives plugged
>> into my machine and the auto-mounter has no trouble finding
>> any or all of them, nor any trouble mounting them if I want, is
>> this what is not working for you guys?
>> brian
>>
>>
> It's not working for *those* guys, it works fine for me :-)
>
> Another thought - there is one thing that can stop a USB removeable drive from being detected - USB autosuspend. You might have enabled this if you've been playing with powerTOP or laptop-mode-tools. It's a common powersaving measure. Google for how to disable it because I can't remember.
>
> The other thing is one that will definitely prevent CDROMs being detected - it's another common powersaving measure, and it's HAL polling. (I know we've been saying it's all udev, but I think HAL is still involved somewhere along the line as udev isn't complete yet). You need HAL polling to detect inserted CDROMs etc. This is another thing that can be disabled with powerTOP or laptop-mode-tools.
> Try sudo hal-disable-polling -enable-polling /dev/sr0
>
> Mark
>

I have a strange thing on my [upgraded] Lucid. Sometimes, like just now, I can't get the cdrom to 
mount a disc. The green light flashes and I can hear it doing its stuff but it gives up after 
about 30sec.
The only way I can mount it is to do:
nigel at nigel:~$ sudo mount /dev/scd0 /media/cdrom0
[sudo] password for nigel:
mount: block device /dev/sr0 is write-protected, mounting read-only
nigel at nigel:~$

It takes ages - well over a minute - but it does eventually mount and I can access the files 
through Dolphin.

I don't know why but it is really annoying.
If I remember right a reboot usually fixes the problem (until next time).

Nigel
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