Bug 190326 – hdparm -d 1 /dev/hdc says HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)

Bug 190326 - hdparm -d 1 /dev/hdc says HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)

Summary:	hdparm -d 1 /dev/hdc says HDIO_SET_DMA failed: Operation not permitted using_...

Status:	CLOSED WORKSFORME

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	hdparm (Show other bugs)
Sub Component:
Version:	5
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Karsten Hopp
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Reported:	2006-05-01 04:01 EDT by kb
Modified:	2007-11-30 17:11 EST (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2006-05-22 05:40:30 EDT
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Description kb 2006-05-01 04:01:53 EDT

Description of problem:
when using default startup for FC5 (grup.conf):
kernel /vmlinuz-2.6.16-1.2096_FC5 ro root=LABEL=/ rhgb quiet

one cannot change DMA settings for CD/DVD-unit.
running
hdparm -d 1 /dev/hdc

gives error:
HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)



Version-Release number of selected component (if applicable):
hdparm v6.3

How reproducible:
see above.


Actual results:
The DMA setting is not changabe.

Expected results:
The DMA should be changable.

Additional info:
Starting up the system using extra parameters:
hdc=noprobe, seems to set the device in DMA mode.

I can help with extra information, but please specify what i should do if you
need more info from me.

Comment 1 kb 2006-05-01 04:02:27 EDT

kernel i use is: 2.6.16-1.2096_FC5.

Comment 2 Karsten Hopp 2006-05-22 05:40:30 EDT

is your CD/DVD drive connected with a 80-wire cable ? It looks like can't use DMA 
with 40-wire cables.

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