> adding libata.force=80c to the kernel boot options
At least in the case of the machine I report, with Ubuntu 9.04, that didn't
work.
Several errors appear later and finally the system is configured for
UDMA/33 instead of UDMA/100
$ dmesg | grep -i udma
[ 3.152722] ata1: PATA max UDMA/100 cmd 0x9000 ctl 0x8800 bmdma 0x7800 irq
10
[ 3.152730] ata2: PATA max UDMA/100 cmd 0x8400 ctl 0x8000 bmdma 0x7808 irq
10
[ 3.504481] ata2.00: ATA-4: ST340823A, 3.07, max UDMA/100
[ 3.504756] ata2.01: ATA-5: ST340016A, 3.75, max UDMA/100
[ 3.520344] ata2.00: configured for UDMA/100
[ 3.536423] ata2.01: configured for UDMA/100
[ 3.689467] ata3: PATA max UDMA/66 cmd 0x1f0 ctl 0x3f6 bmdma 0xd800 irq 14
[ 3.689475] ata4: PATA max UDMA/66 cmd 0x170 ctl 0x376 bmdma 0xd808 irq 15
[ 3.852347] ata3.00: ATAPI: HL-DT-ST DVDRAM GSA-4167B, DL11, max UDMA/33
[ 3.868297] ata3.00: configured for UDMA/33
[ 49.396341] ata2.00: configured for UDMA/100
[...]
[ 50.257375] ata2.01: limiting speed to UDMA/66:PIO4
[ 50.452348] ata2.00: configured for UDMA/100
[ 50.468406] ata2.01: configured for UDMA/66
[ 50.804321] ata2.00: configured for UDMA/100
[ 50.820416] ata2.01: configured for UDMA/66
[ 50.961387] ata2.01: limiting speed to UDMA/33:PIO4
[ 51.156359] ata2.00: configured for UDMA/100
[ 51.172431] ata2.01: configured for UDMA/33
[ 51.508362] ata2.00: configured for UDMA/100
[...]
[ 53.745084] ata2.00: limiting speed to UDMA/66:PIO4
[ 53.940358] ata2.00: configured for UDMA/66
[...]
[ 54.449026] ata2.00: limiting speed to UDMA/33:PIO4
[...]
[ 56.628336] ata2.00: configured for UDMA/33
--
Intrepid kernel UDMA/33 (slow disk transfer rate)
https://bugs.launchpad.net/bugs/285595
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