This affects me too (Karmic x86_64):

r...@brooke:~# blktool /dev/sda dma
HDIO_GET_DMA: Inappropriate ioctl for device
r...@brooke:~# hdparm /dev/sda

/dev/sda:
 multcount     = 16 (on)
 IO_support    =  1 (32-bit)
 readonly      =  0 (off)
 readahead     = 256 (on)
 geometry      = 36481/255/63, sectors = 586072368, start = 0

r...@brooke:~# uname -a
Linux brooke 2.6.31-14-generic #48-Ubuntu SMP Fri Oct 16 14:05:01 UTC 2009 
x86_64 GNU/Linux

I found this bug while trying to figure out why disk performance is so
bad on my box (I get an average SATA disk to SATA disk speed of 6
mb/sec). I tried swapping schedulers but I noticed very little change.

-- 
failed: Inappropriate ioctl for device
https://bugs.launchpad.net/bugs/257840
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