Thanx, + adding options pata_ali atapi_dma=1 to /etc/modules or + adding pata_ali.atapi_dma=1 to boot options (unrecognized command) did not work, still error in dsmeg and choppy video
also sudo echo 1 > /sys/module/pata_ali/parameters/atapi_dma did not work (permission denied). output for hdparm -i /dev/sr0 indicates udma2 mode (disks are in udma5mode) so: i am puzzeled ?? /dev/sr0: Model=SONY DVD RW DW-D56A , FwRev=PFS3 , 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=yes, 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 Drive conforms to: Unspecified: ATA/ATAPI-5 * signifies the current active mode -- DVD playback jerky due to ata_generic module disabling DMA https://bugs.launchpad.net/bugs/175022 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs