Bug 80129 – Kernel does not support DMA with my drive/motherboard

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Bug 80129 - Kernel does not support DMA with my drive/motherboard

Summary:	Kernel does not support DMA with my drive/motherboard

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	kernel (Show other bugs)
Sub Component:
Version:	8.0
Hardware:	i386 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Arjan van de Ven
QA Contact:	Brian Brock
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2002-12-20 05:17 EST by John Barnes
Modified:	2007-04-18 12:49 EDT (History)
CC List:	1 user (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2003-06-05 09:17:14 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
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
Add an attachment (proposed patch, testcase, etc.)

Groups: 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):
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.

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]
dmesg

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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