Found this post, not sure of its relevance to the Ubuntu kernel
http://lkml.org/lkml/2007/3/15/293
"...However the code responsible for manually
enabling DMA ("hdparm -d 1") has a bug which results in DMA being erroneously
enabled - ide_set_dma() incorrectly passes "0" return value to
set_using_dma()...."
But info here suggests the "ide=nodma" switch is obsolete as of kernel 2.6.23
-- note that the above post, and this additional information from a few months
later are from the same author.
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.23-git11.log
commit c223701cf6c706f42840631c1ca919a18e6e2800
Author: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
Date: Tue Oct 16 22:29:58 2007 +0200
ide: add "hdx=nodma" kernel parameter
* Add "hdx=nodma" option allowing user to disallow DMA for a given device.
* Obsolete "ide=nodma" option.
Acked-by: Sergei Shtylyov <[EMAIL PROTECTED]>
Signed-off-by: Bartlomiej Zolnierkiewicz <[EMAIL PROTECTED]>
--
Sparc64 Gutsy Kernel not recognizing ide=nodma
https://bugs.launchpad.net/bugs/159152
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