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This is not the first time that it happens. When I'm watching a DVD on Ubuntu, after sometime, it starts pausing. The CPU goes 100% (wa). I get these messages on syslog:

 sr 0:0:1:0: [sr0]  Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
 [sr0]  Sense Key : Illegal Request [current] 
 [sr0]  Add. Sense: Illegal mode for this track
 sr 0:0:1:0: [sr0] CDB: Read(10): 28 00 00 1a fb 78 00 00 40 00
 [10593.929038] end_request: I/O error, dev sr0, sector 7073248
 [10593.929044] quiet_error: 56 callbacks suppressed
 [10593.929047] Buffer I/O error on device sr0, logical block 1768312
 [10593.929053] Buffer I/O error on device sr0, logical block 1768313
 [10593.929059] Buffer I/O error on device sr0, logical block 1768314
 [10593.929063] Buffer I/O error on device sr0, logical block 1768315
 [10593.929067] Buffer I/O error on device sr0, logical block 1768316
 [10593.929070] Buffer I/O error on device sr0, logical block 1768317
 [10593.929085] Buffer I/O error on device sr0, logical block 1768318
 [10593.929088] Buffer I/O error on device sr0, logical block 1768319
 [10593.929092] Buffer I/O error on device sr0, logical block 1768320
 [10593.929095] Buffer I/O error on device sr0, logical block 1768321

For example, today I was watching a movie on Totem and, after 1 hour, I recieved this error:

Could not read DVD. This may be because the DVD in encrypted and a DVD decryption library is not installed.

I've already tried to use VLC and Totem. It happens on both.

I'm using Ubuntu 12.04 64-bits - Intel Core 2 Duo 1.86GHz - 2MB RAM - DVD-RW LG.

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