From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20020826 Description of problem: hdparm -d1 /dev/hdc fails with: /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) on HITACHI DVD-ROM GD-S200(from /proc/ide/hdc/model) (ide-cdrom version 4.59) The drive DOES do DMA - I've used DMA mode with it before... Actually I think that RH7.3 did not have this problem. Also I have never had any problems with using it in DMA mode before Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. do hdparm -d1 /dev/hdc Actual Results: Cannot set the drive to use DMA Expected Results: Shoule be able to set the drive to use DMA Additional info:
You need to activate DMA while loading the ide-cd module. This is from our Release-Notes: * DMA is disabled on CD-ROM drives in this release in a different but more reliable way than previously. If you are sure that your CD-ROM drive is capable of IDE DMA, place the following line in the /etc/modules.conf file: options ide-cd dma=1
*** Bug 75252 has been marked as a duplicate of this bug. ***