Description of problem: I'm not sure how possible this is, but it seems like there's a good number of DMA issues eg on bugzilla and fedoraforum. While the chipsets are for the most part supported, it seems the problem what driver to actually load IDE or SATA with IDE passthrough. Newer desktop boards may allow the mode to be set like AHCI, or ICH*, ... and when I originally entered a DMA bug report summer 2005, it was asked if i can choose the mode in my bios. I use a laptop with very limited options, so no, I cant choose which mode to use. .. EG my laptop when I use a Fedora kernel will load the IDE drivers instead of SATA - ICH drivers .. and I won't get DMA. An easy workaround is to use my own kernel with custom config or add combined_mode=libata as a kernel arguement. So in order to get DMA working correctly without need for kernel arguemnts like: combined_mode=libata ... the kernel would have to correctly detect the mode to use most likely by probing the BIOS. Is this reasonable? I know there's problems like say my laptop doesn't have that mode as an option so would it even be in the bios. But anyhow just thought I'd ask .. as I'm not advanced enough programmer to help code, so I thought id see what else i can do. Version-Release number of selected component (if applicable): I'm using kernel.org 2.6.18 upstream How reproducible: N/A Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
Created attachment 137242 [details] well .. dmesg for Fedora 5 kernel 2.6.17-1.2187_FC5 Just showing that the IDE driver is loaded for my DVD writer instead of the SATA driver. And since I don't have an option for combined mode or legacy in my bios ... err just wondering if say maybe the mode can be detected by the kernel .. or maybe something as simple as delay loading the ide driver until after the SCSI/SATA drivers are loaded. That way if SCSI / SATA drivers can't pick a device and its truly IDE .. when the IDE driver starts, it will then load the device.
A new kernel update has been released (Version: 2.6.18-1.2200.fc5) based upon a new upstream kernel release. Please retest against this new kernel, as a large number of patches go into each upstream release, possibly including changes that may address this problem. This bug has been placed in NEEDINFO state. Due to the large volume of inactive bugs in bugzilla, if this bug is still in this state in two weeks time, it will be closed. Should this bug still be relevant after this period, the reporter can reopen the bug at any time. Any other users on the Cc: list of this bug can request that the bug be reopened by adding a comment to the bug. In the last few updates, some users upgrading from FC4->FC5 have reported that installing a kernel update has left their systems unbootable. If you have been affected by this problem please check you only have one version of device-mapper & lvm2 installed. See bug 207474 for further details. If this bug is a problem preventing you from installing the release this version is filed against, please see bug 169613. If this bug has been fixed, but you are now experiencing a different problem, please file a separate bug for the new problem. Thank you.
Created attachment 138635 [details] dmesg for new kernel DMA doesnt load in new kernel either (WITH OUT KERNEL ARGUEMTNS) I've had a few thouhts about this... Probing the bios to determine mode and may not even help depending on the computer. A segestion I said before was to delay IDE driver or something so SCSI / SATA drivers load first. However, I also thought of something else. Throw in a check: IF the IDE driver fails to enable DMA for the device, release the device so then it may get loaded by SCSI / SATA driver. But I don't know the exetent of what's involded with this .. but just some ideas as it would be nice for people to have to not worry about adding kernel arguements or custom config to get DMA on their drive.
Oh to be a step ahead same happens in FC6 - just did a fresh install today
This was a problem for me as well. Before doing the modifications suggested by http://www.fedoraforum.org/forum/showthread.php?t=114586, my DVD read speed was 1.5 MB/s. After the modifications, the speed went up to 5.6 MB/s, and the machine is much more responsive. Btw, the upgrade from FC5 to FC6 on this machine took 16 hours! Probably due to this bug. My machine is a Dell D610.
according to http://fedoraproject.org/wiki/Releases/FeatureLibataForPata?highlight=%28CategoryFedora7Features%29 the Fedora 7 wiki intended release fixes include making the necessary changes to Kernel source and configuration and whatnot but if done correctly it will most likely fix the problem If I remember to I'll try out Fedora 7 Test 3 when it comes out and if its broke there hopefully when i report it, there will still be about 2 months to general release (due to test 4) to make sure its in there but no hurries ... great job kernel devs, the workaround to enable dma is simple enough
I'm running RHEL 5.1 on a Dell Latitude D820. I'm still experiencing this issue. : localhost 17#; hdparm -d1 /dev/hdc /dev/hdc: setting using_dma to 1 (on) HDIO_SET_DMA failed: Operation not permitted using_dma = 0 (off) I'm running the latest kernel available for RHEL 5.1: : localhost 18#; uname -r 2.6.18-53.1.13.el5 Should I still need to pass options to my boot line?
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This bug is open for a Fedora version that is no longer maintained and will not be fixed by Fedora. Therefore we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen thus bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.