DMA dropping DVD/cdrom b0rked?

[Schotty]

[quote author=Sarah31 link=board=1;threadid=4905;start=0#48918 date=1031700206]
Sigh turning off the double buffer did nothing. MTRR is compiled into the kernel. I had this problem in Gentoo which i solved by modprobing the ide-cd module in but it is already compiled in here my only other idea is perhaps the ide-scsi modules are interfering with this drive which i set as ide. (for some reason making it scsi emulated prevents me from mounting it).
[/quote]

I have had one or two issues in the past with RedHat or Slack not doing the ide part quite right. It would assign as a scsi emulated device (like LILO told it to do .. both hdc and hdd were told to be scsi emulated) but when the IDE driver came into play, the device just got dropped totally. I mean, no device anymore. Odd. But this was back in the 2.2 kernel days. Since 2.2.14 and newer, I havent had any problems with it. I do recall one of the solutions was to make the scsi and ide stuff modules. I do see that you stated that you had at least the IDE stuff compiled statically intothe kernel.

I am not sure if that works or not, but may be worth a shot. The one difference between your issue and mine, is that you can still see a drive there, and at some capacity, albeit limited, still see that data on the cd/dvd. My CDR and DVD drive were completely gone. RH/Slack just hated them and dropped them after the kernel loaded IDE stuff (which should be after SCSI, IIRC).

HTH

Fixed!!! The problem was with the VIA chipset and the HDPARM line:

hdparm -d 1 -X34 /dev/hdx

fixed it. This solution was found in the ogle FAQs.

Thank you all for your help. I am very happy ;D