Red Hat Bugzilla – Bug 189723
Default hdparm settings applied to DVD burner aren't optimal.
Last modified: 2015-01-04 17:26:43 EST
Description of problem: Unless I tweak manually my DVD burner settings with hdparm, I get 1X burn speed in K3B. Video playback from the DVD drive is choppy in mplayer or xine. Version-Release number of selected component (if applicable): 2.6.15-1.1833_FC4 How reproducible: Always Steps to Reproduce: 1. Reset drive settings to defaults with hdparm -d0 -c0 -u0 -a256 -k0 /dev/hdc 2. Put an DVD+RW 4X in the drive. Choosing speed Auto or 4X won't change anything. 3. Open K3B and burn some stuff. OR 1. Put a DVD movie in drive. 2. Playback with xine or mplayer. Actual results: - Burning crawls at 1X. - DVD playback is choppy. Expected results: Burn speed should be 4X. DVD playback should be smooth. Both are obtained by applying the following options: hdparm -c1 -d1 -u1 -a8 -k1 /dev/hdc Additional info: IMO having to play with hdparm to get DVD drive working at optimal performance is a good example of something that would keep people away from using a Linux desktop.
please attach dmesg output (without any manual hdparm having been done).
Created attachment 130210 [details] Requested dmesg output. Attached is the requested dmesg output.
This doesn't make a great deal of sense, as according to the dmesg, everything was set up to use dma just fine. What does hdparm -i /dev/hdc say ?
Created attachment 133367 [details] hdparm -i /dev/hdc output
[This comment added as part of a mass-update to all open FC4 kernel bugs] FC4 has now transitioned to the Fedora legacy project, which will continue to release security related updates for the kernel. As this bug is not security related, it is unlikely to be fixed in an update for FC4, and has been migrated to FC5. Please retest with Fedora Core 5. Thank you.
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.
Default hdparm settings work great in Fedora Core 6. Verified after deactivating my hdparm line in rc.local and rebooting.