Just a me too. I already posted that issue to the list but without any answer. So I gave it up.
I'm getting no errors which you're encountering but I'm now unable to read/burn cds in DMA mode which is very slow.
Curious what changes (it's there since -pre5) might have triggered that.
hdb: LTN485, ATAPI CD/DVD-ROM drive
hdd: Hewlett-Packard CD-Writer Plus 9100b, ATAPI CD/DVD-ROM drive
00:14.1 IDE interface: Intel Corp. 82371AB PIIX4 IDE (rev 01)
# hdparm -d1 -X34 /dev/hdb
/dev/hdb:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
setting xfermode to 34 (multiword DMA mode2)
using_dma = 0 (off)
$ cat /usr/src/linux/.config| grep IDE | grep -v ^#
CONFIG_IDE=y
CONFIG_BLK_DEV_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_STROKE=y
CONFIG_BLK_DEV_IDECD=m
CONFIG_BLK_DEV_IDEFLOPPY=y
CONFIG_BLK_DEV_IDESCSI=m
CONFIG_IDE_TASK_IOCTL=y
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDEDMA_FORCED=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_IDEDMA_ONLYDISK=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y
CONFIG_VIDEO_DEV=m
CONFIG_VIDEO_PROC_FS=y
CONFIG_VIDEO_BT848=m
CONFIG_VIDEO_SELECT=y
CONFIG_VIDEO_SELECT=y
$ cat /usr/src/linux/.config| grep DMA | grep -v ^#
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_IDEDMA_FORCED=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_IDEDMA_ONLYDISK=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_IDEDMA_AUTO=y
CONFIG_SOUND_DMAP=y
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