Bug 80129
| Summary: | Kernel does not support DMA with my drive/motherboard | ||||||
|---|---|---|---|---|---|---|---|
| Product: | [Retired] Red Hat Linux | Reporter: | John Barnes <john.barnes> | ||||
| Component: | kernel | Assignee: | Arjan van de Ven <arjanv> | ||||
| Status: | CLOSED NOTABUG | QA Contact: | Brian Brock <bbrock> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | medium | ||||||
| Version: | 8.0 | CC: | michael | ||||
| Target Milestone: | --- | ||||||
| Target Release: | --- | ||||||
| Hardware: | i386 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2003-06-05 13:17:14 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: | |||||||
| Attachments: |
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From the release notes:
o 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
Created attachment 88834 [details]
dmesg
Thanks for your very quick response! "options ide-cd dma=1" in /etc/modules.conf works fine. Where should I have been looking to find this out for myself? Quoting Arjan - "From the release notes:" |
Description of problem: Kernel fails to activate DMA on DVD drive Version-Release number of selected component (if applicable): 2.4.18-18.8.0 How reproducible: Fully Steps to Reproduce: 1.Create /etc/sysconfig/harddiskhdc and edit to enable and set dma on DVD drive: USE_DMA=1 EXTRA_PARAMS=-d1 2. Reboot PC 3.See failure in /var/log/messages Dec 20 09:29:09 Titanic hdparm: HDIO_SET_DMA failed: Operation not permitted Dec 20 09:29:09 Titanic hdparm: setting using_dma to 1 (on) Dec 20 09:29:09 Titanic rc.sysinit: Setting hard drive parameters for hdc: succeeded Dec 20 09:29:09 Titanic hdparm: using_dma = 0 (off) Actual results: hdparm always fials to set dma on hdc Expected results: dma should be settable. This is needed for acceptable DVD playback. Additional info: See attachment.