Bug 190326 - hdparm -d 1 /dev/hdc says HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off)
hdparm -d 1 /dev/hdc says HDIO_SET_DMA failed: Operation not permitted using_...
Product: Fedora
Classification: Fedora
Component: hdparm (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Karsten Hopp
Depends On:
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Reported: 2006-05-01 04:01 EDT by kb
Modified: 2007-11-30 17:11 EST (History)
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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RHEL 7.3 requirements from Atomic Host:
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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.
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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