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I've got a brand new clean install of Ubuntu 10.04 running on a 6-year-old HP laptop. Everything works fine with one exception: periodically (say once or twice an hour) the machine will completely freeze for a few seconds while the built-in CD drive spins into life. The mouse, keyboard and trackpad are all unresponsive while this happens, then the drive spins down again and everything comes back to life.

Any idea what might be causing this? I've installed very little on it: the only app I can think of that involves background file access is Dropbox. Might that be the culprit?

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closed as too localized by Luis Alvarado Mar 14 '13 at 15:36

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p.s. If you don't know the exact answer, I'd also appreciate any tips on diagnostic steps I could take to track down the cause myself. I'm very new to Ubuntu. :) –  Mark Whitaker Aug 17 '11 at 23:19
    
Do you still have this problem? If so... start top or htop in a terminal and when it happens have a look if a process started eating up your processortime :) –  Rinzwind Feb 23 '12 at 18:51
    
I'd love to, but as I said in the question the computer completely freezes while this happens. I can't move the cursor, let alone start a terminal and run top. –  Mark Whitaker Feb 23 '12 at 22:51
    
Ofcourse you start top before that happens. All you need to do is keep it open on the desktop. The process is going to show up in top first and then your desktop becomes unresponsive ;-) –  Rinzwind Feb 23 '12 at 23:20
    
If this problem still occurs, I would suggest installing sysstat, atop and atsar. All programs collect information about your running system. If you look after some freeze you maybe get an idea what causes the freeze and can investigate further. –  qbi Mar 31 '12 at 0:12

1 Answer 1

It may be this bug.

You could try putting a blank CD in the tray to see if that stops the issue. If it does it suggests you have this issue and could disable polling the drive using

hal-disable-polling --device /dev/scd0 

You will need to check the device name is /dev/scd0.

See also http://manpages.ubuntu.com/manpages/hardy/man1/hal-disable-polling.1.html

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Thanks very much for the answer but unfortunately that hasn't solved it. I disabled polling on the CD drive this morning but the problem is still occurring. :( –  Mark Whitaker Aug 18 '11 at 13:59

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