I have filed a bug - 758384 - that may be related but I can't tell.
My problem started with a move to Natty beta 1 from Maverick.
I get a similar set of messages:
Apr 12 19:45:53 madrid kernel: [ 4052.064069] ata2: lost interrupt (Status 0x58)
Apr 12 19:45:53 madrid kernel: [ 4052.076298] ata2: drained 65536 bytes to
clear DRQ.
Apr 12 19:45:53 madrid kernel: [ 4052.128699] ata2.00: limiting speed to PIO4
Apr 12 19:45:53 madrid kernel: [ 4052.128710] ata2.00: exception Emask 0x0 SAct
0x0 SErr 0x0 action 0x6 frozen
Apr 12 19:45:53 madrid kernel: [ 4052.128726] sr 1:0:0:0: CDB: Get event status
notification: 4a 01 00 00 10 00 00 00 08 00
Apr 12 19:45:53 madrid kernel: [ 4052.128772] ata2.00: cmd
a0/00:00:00:08:00/00:00:00:00:00/a0 tag 0 pio 16392 in
Apr 12 19:45:53 madrid kernel: [ 4052.128776] res
40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Apr 12 19:45:53 madrid kernel: [ 4052.128787] ata2.00: status: { DRDY }
Apr 12 19:45:53 madrid kernel: [ 4052.128827] ata2: soft resetting link
Apr 12 19:45:53 madrid kernel: [ 4052.308458] ata2.00: configured for PIO4
Apr 12 19:45:53 madrid kernel: [ 4052.308879] ata2: EH complete
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https://bugs.launchpad.net/bugs/694825
Title:
ata_bmdma crashing at random(?)
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