Bug#296762: Dell Poweredge 750: CD detect fails

[MI <mi@frenetic.ch>]

> > 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...