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Kernel Messages

This is a collection of trying to make sense of some output that can be seen by dmesg or looking at your system log.

Here's one I get when putting a DVD in the drive (and I only figured this out on accident, but it's been haunting me for years, so hurray!):

Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#15 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#15 Sense Key : Illegal Request [current]
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#15 Add. Sense: Read of scrambled sector without authentication
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#15 CDB: Read(10) 28 00 00 31 29 80 00 00 40 00
Apr  9 02:19:34 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#16 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#16 Sense Key : Illegal Request [current]
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#16 Add. Sense: Read of scrambled sector without authentication
Apr  9 02:19:34 tux kernel: sr 1:0:0:0: [sr0] tag#16 CDB: Read(10) 28 00 00 31 29 80 00 00 02 00
Apr  9 02:19:34 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552
Apr  9 02:19:34 tux kernel: Buffer I/O error on dev sr0, logical block 1610944, async page read
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#17 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#17 Sense Key : Illegal Request [current]
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#17 Add. Sense: Read of scrambled sector without authentication
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#17 CDB: Read(10) 28 00 00 31 29 80 00 00 40 00
Apr  9 02:19:36 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#18 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#18 Sense Key : Illegal Request [current]
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#18 Add. Sense: Read of scrambled sector without authentication
Apr  9 02:19:36 tux kernel: sr 1:0:0:0: [sr0] tag#18 CDB: Read(10) 28 00 00 31 29 80 00 00 02 00
Apr  9 02:19:36 tux kernel: blk_update_request: I/O error, dev sr0, sector 12887552
Apr  9 02:19:36 tux kernel: Buffer I/O error on dev sr0, logical block 1610944, async page read

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