--- Jeff Spaleta <jspaleta@xxxxxxxxx> wrote: > On Nov 26, 2007 4:30 PM, Antonio Olivares > <olivares14031@xxxxxxxxx> wrote: > > If one enables hdparm DVD playback will not be > jumpy, however when applying hdparm I get > > Perhaps the libata faq will give you the most basic > answer > http://linux-ata.org/faq.html#old_ioctls > > Now are you sure that the drive isn't already using > dma by default? > > hdparm -i /dev/cdrom > > will list the supported DMA modes and will indicate > which one is > currently in use. By default my DVD drive has the > most advanced DMA > enabled by default > > DMA modes: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 > UDMA modes: udma0 udma1 *udma2 > > * signifies the current active mode [root@localhost ~]# hdparm -i /dev/cdrom /dev/cdrom: Model=TSSTcorpCD/DVDW SH-S182D , FwRev=SB03 , SerialNo= Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic } RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0 BuffType=unknown, BuffSize=0kB, MaxMultSect=0 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0 IORDY=on/off, tPIO={min:227,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio1 pio2 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 *udma2 AdvancedPM=no * signifies the current active mode [root@localhost ~]# What is the difference between UDMA and DMA? > > As to why hdparm is attempting to use the legacy > ioctls, that I have no idea. > > -jef > > -- > fedora-list mailing list > fedora-list@xxxxxxxxxx > To unsubscribe: > https://www.redhat.com/mailman/listinfo/fedora-list > Thank you Jeff and Todd for answering this question. I do not know as to which option to use add this to /etc/modprobe.conf options libata atapi_enabled=1 or add hdc=noprobe to the kernel command /boot/grub/grub.conf. If I do the latter where exactly do I need to place the parameter, ie., after quiet rhgb or before right after kernel line? Regards, Antonio ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs
