Bug#296762: Dell Poweredge 750: CD detect fails

[MI]

This Dell PE750 has a "Samsung SN-124" CD-ROM drive (as reported by the
BIOS), which is not recognized. Neither during install (even though I
booted from it to start the install), neither afterwards. The system is
up and running now, but there is no CD drive.
I finally got the CD to be recognized with the tip from 
http://kerneltrap.org/node/3971#comment-12554 :

 echo ide-generic  >>/etc/mkinitrd/modules
 echo ata_piix     >>/etc/mkinitrd/modules
 echo sd_mod       >>/etc/mkinitrd/modules
 cp /boot/initrd.img-2.6.8-2-386  /boot/initrd.img-2.6.8-2-386.bak
 mkinitrd -o /boot/initrd.img-2.6.8-2-386
 shutdown -r now
Now I have the problem that I cannot enable DMA on the CD drive, which 
seems to be a very common problem.

 # hdparm -d1 /dev/hda
 /dev/hda:
  setting using_dma to 1 (on)
  HDIO_SET_DMA failed: Operation not permitted
  using_dma    =  0 (off)
Re-compiling the kernel with piix (or should it be ata_piix?) included 
instead of as a module is said to fix the DMA problem. But I'd rather 
have the module fixed.


Hope this follow-up helps...

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