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Bug 80129 - Kernel does not support DMA with my drive/motherboard
Kernel does not support DMA with my drive/motherboard
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Arjan van de Ven
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2002-12-20 05:17 EST by John Barnes
Modified: 2007-04-18 12:49 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2003-06-05 09:17:14 EDT
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
dmesg (7.01 KB, text/plain)
2002-12-20 05:47 EST, John Barnes
no flags Details

  None (edit)
Description John Barnes 2002-12-20 05:17:27 EST
Description of problem:
Kernel fails to activate DMA on DVD drive

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1.Create /etc/sysconfig/harddiskhdc and edit to enable and set dma on DVD drive:
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: 
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.
Comment 1 Arjan van de Ven 2002-12-20 05:29:06 EST
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
Comment 2 John Barnes 2002-12-20 05:47:03 EST
Created attachment 88834 [details]
Comment 3 John Barnes 2002-12-20 06:10:35 EST
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?
Comment 4 Michael Lee Yohe 2002-12-20 10:20:42 EST
Quoting Arjan - "From the release notes:"

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