Bug 232147

Summary: Wrong DMA mode probed / Can't set mode > udma(33)
Product: [Fedora] Fedora Reporter: goahead <goahead>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED CURRENTRELEASE QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 6   
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: 2.6.20-1.2944.fc6 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-04-16 23:26:40 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
output of hdparm -iI on FC6 and on Kanotix, dmesg none

Description goahead 2007-03-13 23:28:57 UTC 
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-
1.2911.6.5.fc6


How reproducible: always


Steps to Reproduce:
1. Boot the system
2. 
3.
  
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 23:28:57 UTC 
Created attachment 150003 [details]
output of hdparm -iI on FC6 and on Kanotix, dmesg
Comment 2 goahead 2007-03-14 19:34:04 UTC 
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 20:58:32 UTC 
Please test 2.6.20-1.2925.fc6
Comment 4 goahead 2007-03-15 19:09:33 UTC 
Just tested 2.6.20-1.2925.fc6. It shows the same problem. Only udma2 or less 
possible.
Comment 5 Chuck Ebbert 2007-03-26 14:37:01 UTC 
Test kernels (1.2937) for this issue are at:

http://people.redhat.com/cebbert

Please test and report back.
Comment 6 goahead 2007-03-27 22:20:53 UTC 
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.