You should try hdparm -d1 -X66 /dev/hdc as root and on my Plextors (716A burner and 116A reader) it works without problems. Still have to find out where to put this statements for both drives so they work at startup of the system.I have an FC3 system ASUS P5GD2 deluxe with a Plextor PX-716A DVD burner.
When I try to play DVDs in this drive the frame rate is horrible. Jerky playback, dropped frames.
I ran xine-check and I found that DMA does not appear to be set for this
DVD drive. I tried setting DMA on using
hdparm -d1 /dev/hda
But I get the following:
HDIO_SET_DMA failed: Operation not permitted
I checked the jumper settings on the drive and the bios settings and best I can tell they should allow DMA to be setup.
The other odd thing I have noted is that when I insert a DVD or CD in this drive I have to manually mount it to access it. I used this drive to load the system from the FC3 CDs. I have used this drive to burn a CD-RW with no problems.
Ultimately trying to get this drive to work with Mythtv.
Any ideas on this one?
The issue you see that you manually have to mount them seems to be a universal problem with Plextors under FC (don't know about other distros). Someone on this list also noticed this on FC (with a 716A and 320A) and filed a bug-report:
https://bugzilla.redhat.com/beta/show_bug.cgi?id=143421 The hint about upgrading the kernel to a testing one doesn't help btw.
Kind regards, Angelo
