[mythtv-users] DVD drive activity disrupts video

[Brian C. Huffman]

mrrooster at gmail.com wrote:
> 2009/3/9 Brian C. Huffman <bhuffman at graze.net>
> 
> > All,
> >
> > I've been having problems with mythtv and playing DVDs for some 
time.
> > When playing a DVD I get video choppiness every so often during high
> > motion scenes. I've noticed that if I rip the DVD and then watch it
> > there's no problem. Recently I've watched closer and it seems that 
the
> > video skips seem to be in time with the activity light on the DVD 
drive.
> >
> > [snip]
>
> What interface is on the DVD drive? IDE or SATA (or another?), is it 
using
> DMA mode? sounds like it may be stuck in PIO?

It's an IDE drive, but I'm running F10 and it's using the ata_piix 
driver, so it shows up like a SATA drive (/dev/sr0).

Excerpt from boot messages:

Mar 11 12:42:28 localhost kernel: scsi4 : pata_marvell
Mar 11 12:42:28 localhost kernel: scsi5 : pata_marvell
Mar 11 12:42:28 localhost kernel: ata5: PATA max UDMA/100 cmd 0x2018 ctl 
0x2024 bmdma 0x2000 irq 17
Mar 11 12:42:28 localhost kernel: ata6: DUMMY
Mar 11 12:42:28 localhost kernel: ata5.00: ATA-7: HDT722516DLAT80, 
V43OA70A, max UDMA/133
Mar 11 12:42:28 localhost kernel: ata5.00: 321672960 sectors, multi 16: 
LBA48
Mar 11 12:42:28 localhost kernel: ata5.01: ATAPI: PIONEER DVD-RW  
DVR-106D, 1.07, max UDMA/33
Mar 11 12:42:28 localhost kernel: ata5.00: configured for UDMA/100
Mar 11 12:42:28 localhost kernel: ata5.01: configured for UDMA/33
Mar 11 12:42:28 localhost kernel: scsi 4:0:0:0: Direct-Access     ATA    
  HDT722516DLAT80  V43O PQ: 0 ANSI: 5
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] 321672960 512-byte 
hardware sectors (164697 MB)
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] Write Protect is off
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] Write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] 321672960 512-byte 
hardware sectors (164697 MB)
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] Write Protect is off
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] Write cache: 
enabled, read cache: enabled, doesn't support DPO or FUA
Mar 11 12:42:28 localhost kernel: sda: sda1 sda2
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: [sda] Attached SCSI disk
Mar 11 12:42:28 localhost kernel: sd 4:0:0:0: Attached scsi generic sg0 
type 0
Mar 11 12:42:28 localhost kernel: scsi 4:0:1:0: CD-ROM            
PIONEER  DVD-RW  DVR-106D 1.07 PQ: 0 ANSI: 5
Mar 11 12:42:28 localhost kernel: sr0: scsi3-mmc drive: 62x/62x writer 
cd/rw xa/form2 cdda tray
Mar 11 12:42:28 localhost kernel: Uniform CD-ROM driver Revision: 3.20
Mar 11 12:42:28 localhost kernel: sr 4:0:1:0: Attached scsi generic sg1 
type 5