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_...
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Fedora
Classification: Fedora
Component: hdparm
Version: 5
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Karsten Hopp
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-05-01 08:01 UTC by kb
Modified: 2007-11-30 22:11 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2006-05-22 09:40:30 UTC
Type: ---
Embargoed:

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Description kb 2006-05-01 08:01:53 UTC 
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 08:02:27 UTC 
kernel i use is: 2.6.16-1.2096_FC5.
Comment 2 Karsten Hopp 2006-05-22 09:40:30 UTC 
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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