Recently my Kubuntu Jaunty installation has taken to not mounting previously OK DVDs. What I see upon insertion of a disc is the automount fail:

Nov 18 18:31:23 bjork kernel: [17654.552433] sr0: CDROM not ready yet.
Nov 18 18:31:25 bjork kernel: [17656.563408] sr0: CDROM not ready yet.
Nov 18 18:31:27 bjork kernel: [17658.594960] sr0: CDROM not ready yet.
Nov 18 18:31:29 bjork kernel: [17660.626754] sr0: CDROM not ready yet.
Nov 18 18:31:31 bjork kernel: [17662.659556] sr0: CDROM not ready yet.
Nov 18 18:31:33 bjork kernel: [17664.691350] sr0: CDROM not ready yet.
Nov 18 18:31:35 bjork kernel: [17666.295891] sr 1:0:0:0: [sr0] unaligned transfer
Nov 18 18:31:35 bjork kernel: [17666.295914] sr 1:0:0:0: [sr0] unaligned transfer
Nov 18 18:31:35 bjork kernel: [17666.295928] sr 1:0:0:0: [sr0] unaligned transfer
Nov 18 18:31:35 bjork kernel: [17666.295942] sr 1:0:0:0: [sr0] unaligned transfer
(repeated many times)

This persists across discs and across reboots.

I looked around the net and I at least found some evidence of the "unaligned transfer" problem; supposedly this happens when something tries to access the drive before it's ready, and (at least for some kernels) can get the responsible module in a permanently confused state. However, I'm not accessing the disc manually, some automounter or something is accessing it -- I don't even know what.

I'm using Kubuntu Jaunty with KDE 4.3.2. Kernel string from bootup:
Nov 18 13:37:33 bjork kernel: [ 0.000000] Linux version 2.6.28-14-generic (buildd@yellow) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #47-
Ubuntu SMP Sat Jul 25 01:19:55 UTC 2009 (Ubuntu 2.6.28-14.47-generic)

Any suggestions as to the cause or solution?

thanks,

eric

Most of the recent distros use HAL and DBUS to auto mount removable media. There is a way to disable it but since I generally do not like HAL and DBUS I don't build them into my working system unless I need a application that requires them, so I am not sure how you disable it. Have you had any problems with this disc drive before and how old is it? Its possible its starting to die, although I have had trouble with the sata dvd drives giving me io errors.