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cdrom no longer functional after 13.04 -> 13.10 kubuntu upgrade

eject works intermittently

mount /dev/sr0 /cdrom hangs until i manually eject the disk k3b sometimes fails to start, when it starts it either reports no optical or no writable disk

lshw hangs until i ctrl-c it

# dmesg | grep -B9 -A9 CD-ROM
[    1.767897] usb 2-3: Manufacturer: Bison Corp.
[    1.770514] Console: switching to colour frame buffer device 170x48
[    1.776752] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[    1.776755] radeon 0000:00:01.0: registered panic notifier
[    1.777056] [drm] Initialized radeon 2.34.0 20080528 for 0000:00:01.0 on minor 0
[    1.824309] ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[    1.824368] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[    1.836818] ata2.00: ATAPI: MATSHITADVD-RAM UJ8B1AS, 8.21, max UDMA/100
[    1.850083] ata2.00: configured for UDMA/100
[    1.856436] scsi 1:0:0:0: CD-ROM            MATSHITA DVD-RAM UJ8B1AS  8.21 PQ: 0 ANSI: 5
[    1.859393] sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2 cdda tray
[    1.859400] cdrom: Uniform CD-ROM driver Revision: 3.20
[    1.859783] sr 1:0:0:0: Attached scsi CD-ROM sr0
[    1.859957] sr 1:0:0:0: Attached scsi generic sg0 type 5
[    1.874442] ata4.00: ATA-8: ST9500325AS, 0011LVM1, max UDMA/100
[    1.874449] ata4.00: 976773168 sectors, multi 16: LBA48 NCQ (depth 31/32)
[    1.877317] ata4.00: configured for UDMA/100
[    1.877783] scsi 3:0:0:0: Direct-Access     ATA      ST9500325AS      0011 PQ: 0 ANSI: 5
[    1.877997] sd 3:0:0:0: [sda] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[    1.878084] sd 3:0:0:0: Attached scsi generic sg1 type 0
[    1.878302] sd 3:0:0:0: [sda] Write Protect is off
[    1.878305] sd 3:0:0:0: [sda] Mode Sense: 00 3a 00 00

i'm guessing this is a kernel regression relating to the merging of ata and scsi device handling

any solutions? thanks

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