Bug 232147 - Wrong DMA mode probed / Can't set mode > udma(33)
Wrong DMA mode probed / Can't set mode > udma(33)
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i686 Linux
medium Severity medium
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Assigned To: Kernel Maintainer List
Brian Brock
Depends On:
  Show dependency treegraph
Reported: 2007-03-13 19:28 EDT by goahead
Modified: 2007-11-30 17:11 EST (History)
0 users

See Also:
Fixed In Version: 2.6.20-1.2944.fc6
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-04-16 19:26:40 EDT
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Regression: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
output of hdparm -iI on FC6 and on Kanotix, dmesg (5.36 KB, text/plain)
2007-03-13 19:28 EDT, goahead
no flags Details

  None (edit)
Description goahead 2007-03-13 19:28:57 EDT
Description of problem: udma(133) ide disk gets wrongly detected as udma(33) 
and it is not possible to set it to anything above udma(33) with hdparm.

Version-Release number of selected component (if applicable): 2.6.19-

How reproducible: always

Steps to Reproduce:
1. Boot the system
Actual results: Have to use a udma6 disk in udma2 mode, getting 27MB/s instead 
of 56MB/s

Expected results: Correct detection of harddisk 

Additional info: The IDE driver / Southbridge used are SIS5513 / SIS962. Same 
system is detected correctly and works fine in udma6 mode with 2.6.12-
1.1378_FC3 and with Knoppix or Kanotix (2005-02) Live CDs. And yes, I'm using a 
80pole cable.
Comment 1 goahead 2007-03-13 19:28:57 EDT
Created attachment 150003 [details]
output of hdparm -iI on FC6 and on Kanotix, dmesg
Comment 2 goahead 2007-03-14 15:34:04 EDT
The same system with kernel 2.6.19-1.2895.fc6 does not show this issue. The 
harddisk is recognized correctly and operates in udma6 mode.
Comment 3 Chuck Ebbert 2007-03-14 16:58:32 EDT
Please test 2.6.20-1.2925.fc6
Comment 4 goahead 2007-03-15 15:09:33 EDT
Just tested 2.6.20-1.2925.fc6. It shows the same problem. Only udma2 or less 
Comment 5 Chuck Ebbert 2007-03-26 10:37:01 EDT
Test kernels (1.2937) for this issue are at:


Please test and report back.
Comment 6 goahead 2007-03-27 18:20:53 EDT
Tested kernel 1.2937. This time the harddisk is detected correctly as udma6. The
speed hdparm reports corresponds to this disks normal udma6 speed. It is also
possible to set the speed to any value up to udma6. It seems the issue is
resolved in this kernel. Thanks.

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