Comment 7 for bug 112410

One thing that's interesting, that I should have included before, is that in the kernel release where things were acting normally, my dvd and cd drives were appearing as standard IDE drives, the problem surfaces when they're routed through scsi emulation. I've tried loading the generic ide module before the ata_piix module (my sata/ide controller is an Intel ICH5). This causes the optical drives to be loaded as plain IDE devices but does not allow DMA to be used making it a bad fix. Similarly, I'm unable to use DMA modes when using the old piix module.

dmesg output during the problem:
[182619.863213] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[182619.863224] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0xac data 8 in
[182619.863229] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[182626.846590] ata2: port is slow to respond, please be patient (Status 0xd0)
[182649.795220] ata2: port failed to respond (30 secs, Status 0xd0)
[182649.795230] ata2: soft resetting port
[182651.665924] ata2.00: configured for UDMA/33
[182651.665953] ata2: EH complete
[182711.705585] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[182711.705597] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0xac data 8 in
[182711.705602] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[182718.689104] ata2: port is slow to respond, please be patient (Status 0xd0)
[182741.637735] ata2: port failed to respond (30 secs, Status 0xd0)
[182741.637744] ata2: soft resetting port
[182742.292034] ata2.00: configured for UDMA/33
[182742.292063] ata2: EH complete
[182802.192080] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[182802.192092] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0xac data 8 in
[182802.192097] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[182809.171612] ata2: port is slow to respond, please be patient (Status 0xd0)
[182832.136195] ata2: port failed to respond (30 secs, Status 0xd0)
[182832.136206] ata2: soft resetting port
[182832.794459] ata2.00: configured for UDMA/33
[182832.794486] ata2: EH complete
[182892.738399] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
[182892.738412] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0xac data 8 in
[182892.738415] res 40/00:03:00:00:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
[182899.721921] ata2: port is slow to respond, please be patient (Status 0xd0)
[182922.670548] ata2: port failed to respond (30 secs, Status 0xd0)
[182922.670558] ata2: soft resetting port
[182923.324826] ata2.00: configured for UDMA/33
[182923.324856] ata2: EH complete
[182927.997363] UDF-fs: Partition marked readonly; forcing readonly mount
--- snip ---- (At this point the DVD is opened)