With releases 8.04, 8.10 and now 9.04 beta I can confirm the same
behaviour.
In my case the problem shows up with an MSI CD writer/DVD reader:
4.928302] ata6.00: ATAPI: ATAPI COMBO52XMAX, VER 1.40, max UDMA/100
[ 4.928318] ata6: nv_mode_filter: 0x3f39f&0x3f01f->0x3f01f, BIOS=0x3f000
(0xc700c600) ACPI=0x3f01f (20:600:0x13)
[ 4.928320] ata6.00: limited to UDMA/33 due to 40-wire cable
[ 4.944246] ata6.00: configured for UDMA/33
hdparm confirms that the device is capable of UDMA/100 (mode 5) but
confirms that it is running at 33 (mode 2):
ATAPI CD-ROM, with removable media
Model Number: ATAPI COMBO52XMAX
Serial Number:
Firmware Revision: VER 1.40
Standards:
Likely used CD-ROM ATAPI-1
Configuration:
DRQ response: 50us.
Packet size: 12 bytes
Capabilities:
LBA, IORDY(cannot be disabled)
DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4 udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=227ns IORDY flow control=120ns
A UDMA/133 hard disc on the same motherboard is no problem:-
4.728459] ata5.00: ATA-7: Maxtor 2F030J0, VAM51JJ0, max UDMA/133
[ 4.728462] ata5.00: 60058656 sectors, multi 1: LBA
[ 4.728480] ata5: nv_mode_filter: 0x7f39f&0x7f01f->0x7f01f, BIOS=0x7f000
(0xc700c600) ACPI=0x7f01f (15:600:0x13)
[ 4.744392] ata5.00: configured for UDMA/133
This had previously been reported under bug 285595
--
Wrong UDMA mode due to error in 40/80 wire cable detection
https://bugs.launchpad.net/bugs/323302
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