Bug 78718
Summary: | DMA does not work for DVD/CDROM drives with kernel-2.4.18-18.7.x.i686.rpm | ||
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Product: | [Retired] Red Hat Linux | Reporter: | Eric Yeo <rhbz> |
Component: | kernel | Assignee: | Arjan van de Ven <arjanv> |
Status: | CLOSED NOTABUG | QA Contact: | Brian Brock <bbrock> |
Severity: | medium | Docs Contact: | |
Priority: | medium | ||
Version: | 7.3 | ||
Target Milestone: | --- | ||
Target Release: | --- | ||
Hardware: | i686 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | Bug Fix | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2002-11-28 09:22:12 UTC | Type: | --- |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
https://rhn.redhat.com/errata/RHSA-2002-206.html NOTE: As with the 8.0 release, IDE DMA on CD-ROM drives is disabled by default. 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 That worked. Thanks. Perhaps the 7.3 documentation needs updating? Updating the docs is definitely a good idea. And this extra flag in modules.conf seems a little redundant. DMA for CD drives was already disabled by default and had to be enabled using harddiskhdx. Now one will need to enable DMA for CD drives on 2 different places (at least on 7.x). You are making it really hard to reenable DMA on CD drives. No need for that... |
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.1) Gecko/20021003 Description of problem: kernel-2.4.18-18.7.x.i686.rpm appears to be compiled with DMA enabled for disks only. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: Run "hdparm -d 1 /dev/hdc" where /dev/hdc is a DVD/CDROM drive. Actual Results: Hdparm has the following output > /dev/hdc: > setting using_dma to 1 (on) > HDIO_SET_DMA failed: Operation not permitted > using_dma = 0 (off) Expected Results: The DVD/CDROM drive should have DMA enabled. Additional info: This problem was seen in kernel-2.4.18-17.7.x.i686.rpm and kernel-2.4.18-18.7.x.i686.rpm (recent updates). DMA can be enabled with kernel prior to these ones.