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
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