This bug still affects Jaunty on my machine, though I haven't been able to capture a KP.

I have the same IDE controller (and what looks like the same motherboard).

From lshw:

    description: Desktop Computer
    product: VT8367-8235
    vendor: VIA Technologies, Inc.
    width: 32 bits
    capabilities: smbios-2.2 dmi-2.2
    configuration: boot=normal chassis=desktop
  *-core
       description: Motherboard
       product: VT8367-8235
       physical id: 0
     *-firmware
          description: BIOS
          vendor: Phoenix Technologies, LTD
          physical id: 0
          version: 6.00 PG (06/19/2003)
          size: 128KiB
          capacity: 192KiB
          capabilities: isa pci pnp apm upgrade shadowing escd cdboot bootselect socketedrom edd int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer int10video acpi usb agp ls120boot zipboot

*****SNIP*****

        *-ide
             description: IDE interface
             product: VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE
             vendor: VIA Technologies, Inc.
             physical id: 11.1
             bus info: pci@0000:00:11.1
             logical name: scsi0
             logical name: scsi1
             version: 06
             width: 32 bits
             clock: 33MHz
             capabilities: ide pm bus_master cap_list emulated
             configuration: driver=pata_via latency=32
           *-disk:0
                description: ATA Disk
                product: Maxtor 6Y160P0
                vendor: Maxtor
                physical id: 0
                bus info: scsi@0:0.0.0
                logical name: /dev/sda
                version: YAR4
                serial: Y47KX8JE
                size: 152GiB (163GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=00038580
              *-volume:0
                   description: EXT4 volume
                   vendor: Linux
                   physical id: 1
                   bus info: scsi@0:0.0.0,1
                   logical name: /dev/sda1
                   logical name: /
                   version: 1.0
                   serial: c420eb8e-fbb0-43e9-bd91-213984382fe6
                   size: 19GiB
                   capacity: 19GiB
                   capabilities: primary bootable journaled extended_attributes large_files huge_files dir_nlink recover extents ext4 ext2 initialized
                   configuration: created=2009-09-05 12:18:39 filesystem=ext4 modified=2009-10-04 12:54:30 mount.fstype=ext4 mount.options=rw,relatime,errors=remount-ro,barrier=1,data=ordered mounted=2009-10-04 12:54:30 state=mounted
              *-volume:1
                   description: Linux swap volume
                   physical id: 2
                   bus info: scsi@0:0.0.0,2
                   logical name: /dev/sda2
                   version: 1
                   serial: 32e84da8-734e-4af1-b160-17aff229be56
                   size: 1953MiB
                   capacity: 1953MiB
                   capabilities: primary nofs swap initialized
                   configuration: filesystem=swap pagesize=4096
              *-volume:2
                   description: EXT4 volume
                   vendor: Linux
                   physical id: 3
                   bus info: scsi@0:0.0.0,3
                   logical name: /dev/sda3
                   logical name: /home
                   version: 1.0
                   serial: e104b508-aa50-4be0-9a5f-ce9dacf813d5
                   size: 131GiB
                   capacity: 131GiB
                   capabilities: primary journaled extended_attributes large_files recover extents ext4 ext2 initialized
                   configuration: created=2008-01-13 17:46:13 filesystem=ext4 label=/home/shared modified=2009-10-04 12:54:31 mount.fstype=ext4 mount.options=rw,barrier=1,data=ordered mounted=2009-10-04 12:54:31 state=mounted
           *-cdrom
                description: DVD writer
                product: DVD DD 2X16X4X16
                vendor: ATAPI
                physical id: 1
                bus info: scsi@1:0.0.0
                logical name: /dev/cdrom
                logical name: /dev/cdrw
                logical name: /dev/dvd
                logical name: /dev/dvdrw
                logical name: /dev/scd0
                logical name: /dev/sr0
                version: G7H9
                capabilities: removable audio cd-r cd-rw dvd dvd-r
                configuration: ansiversion=5 status=nodisc
           *-disk:1
                description: ATA Disk
                product: ST3250824A
                vendor: Seagate
                physical id: 0.1.0
                bus info: scsi@1:0.1.0
                logical name: /dev/sdb
                version: 3.AA
                serial: 5ND5P07E
                size: 232GiB (250GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=000935ea
              *-volume
                   description: EXT4 volume
                   vendor: Linux
                   physical id: 1
                   bus info: scsi@1:0.1.0,1
                   logical name: /dev/sdb1
                   logical name: /home/shared
                   version: 1.0
                   serial: 4ec4a838-a612-4e7b-a940-a506e4afb575
                   size: 232GiB
                   capacity: 232GiB
                   capabilities: primary journaled extended_attributes large_files recover extents ext4 ext2 initialized
                   configuration: created=2008-08-09 21:28:32 filesystem=ext4 modified=2009-10-04 12:54:32 mount.fstype=ext4 mount.options=rw,barrier=1,data=ordered mounted=2009-10-04 12:54:32 state=mounted

*****SNIP*****