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    SubjectRe: 2.4.21-rc5: DMA disabled for IDE Cdrom, works with 2.4.20
    On Wed, May 28, 2003 at 02:03:52AM +0200, wrote:
    > I have now disabled "CONFIG_IDEDMA_PCI_AUTO" such that initially DMA is
    > disabled for /dev/hda and /dev/hdb. I have then enabled DMA only for
    > /dev/hdb with hdparm (keeping DMA disabled for /dev/hda) but the problem
    > persists and DMA for /dev/hdb will be disabled when I try to mount a
    > cdrom. It seems that the DMA-setting for /dev/hda has no influence on
    > this.

    Try using hdparm -d1 -X34 on /dev/hda and /dev/hdb

    This will turn on DMA and use the same DMA mode for both devices. I
    wouldn't be surprised if the new IDE was more strict (maybe more spec
    compliant?) than the previous version.
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