As far as I understand this is not a bug. See this:
http://linux-ata.org/faq.html#io32
So unfortunately, no one is interested in implementing 32-bit mode in libATA.
** Changed in: hdparm (Ubuntu)
Status: Incomplete => Invalid
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[Feisty] Cannot set 32bit mode and DMA
https://bugs.launchpad.net/bugs/135473
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