[mythtv-users] Very lumpy DVD playback

Paul Gardiner lists at glidos.net
Sun Mar 1 17:45:55 UTC 2009


This isn't really MythTV specific, but I hope no one minds my
asking about it here. It's the sort of thing someone else using
MythTV may well have run into.

I've just changed the motherboard in my frontend, now using a
K9AGM2, which has the AMD 690G and SB600 chips. I'm running into
problems with some DVD drives working ok and some not, although
the nonworking ones have been fine with another motherboard. The
logs (partly included below) show initialisation trying various
speeds of DMA before settling on PIO4. I'm wondering if this
might be the sort of problem I can solve by altering interupt or
DMA usage. I know one of the drives that fails is also a DVD
writer. I'm not sure of the other, but was wondering if writers
appear as two devices and that might cause interrupt allocation
problems (although I really have no idea what I'm talking about).

Feb 28 16:46:11 slinky user.info kernel: ACPI: PCI Interrupt 
0000:00:14.1[A] -> GSI 16 (level, low) -> IRQ 16
Feb 28 16:46:11 slinky user.debug kernel: PCI: Setting latency timer of 
device 0000:00:14.1 to 64
Feb 28 16:46:11 slinky user.info kernel: scsi0 : pata_atiixp
Feb 28 16:46:11 slinky user.info kernel: scsi1 : pata_atiixp
Feb 28 16:46:11 slinky user.info kernel: ata1: PATA max UDMA/100 cmd 
0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14
Feb 28 16:46:11 slinky user.info kernel: ata2: PATA max UDMA/100 cmd 
0x170 ctl 0x376 bmdma 0xff08 irq 15
Feb 28 16:46:11 slinky user.info kernel: ata1.00: ATAPI: HL-DT-STDVD-RAM 
GH22NP20, 1.02, max UDMA/66
Feb 28 16:46:11 slinky user.info kernel: ata1.00: configured for UDMA/66
Feb 28 16:46:11 slinky user.info kernel: usb 1-2: new full speed USB 
device using ohci_hcd and address 3
Feb 28 16:46:11 slinky user.info kernel: usb 1-2: configuration #1 
chosen from 1 choice
Feb 28 16:46:11 slinky user.err kernel: ata1.00: exception Emask 0x0 
SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 28 16:46:11 slinky user.err kernel: ata1.00: cmd 
a0/01:00:00:60:00/00:00:00:00:00/a0 tag 0 dma 96 in
Feb 28 16:46:11 slinky user.warn kernel:          cdb 12 00 00 00 60 00 
00 00  00 00 00 00 00 00 00 00
Feb 28 16:46:11 slinky user.warn kernel:          res 
40/00:02:00:24:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 28 16:46:11 slinky user.err kernel: ata1.00: status: { DRDY }
Feb 28 16:46:11 slinky user.info kernel: ata1: soft resetting link
Feb 28 16:46:11 slinky user.info kernel: ata1.00: configured for UDMA/66
Feb 28 16:46:11 slinky user.info kernel: ata1: EH complete
Feb 28 16:46:11 slinky user.warn kernel: ata1.00: limiting speed to 
UDMA/44:PIO4
Feb 28 16:46:11 slinky user.err kernel: ata1.00: exception Emask 0x0 
SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 28 16:46:11 slinky user.err kernel: ata1.00: cmd 
a0/01:00:00:60:00/00:00:00:00:00/a0 tag 0 dma 96 in
Feb 28 16:46:11 slinky user.warn kernel:          cdb 12 00 00 00 60 00 
00 00  00 00 00 00 00 00 00 00
Feb 28 16:46:11 slinky user.warn kernel:          res 
40/00:02:00:24:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 28 16:46:11 slinky user.err kernel: ata1.00: status: { DRDY }
Feb 28 16:46:11 slinky user.info kernel: ata1: soft resetting link
Feb 28 16:46:11 slinky user.info kernel: ata1.00: configured for UDMA/44
Feb 28 16:46:11 slinky user.info kernel: ata1: EH complete
Feb 28 16:46:11 slinky user.warn kernel: ata1.00: limiting speed to 
UDMA/33:PIO4
Feb 28 16:46:11 slinky user.err kernel: ata1.00: exception Emask 0x0 
SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 28 16:46:11 slinky user.err kernel: ata1.00: cmd 
a0/01:00:00:60:00/00:00:00:00:00/a0 tag 0 dma 96 in
Feb 28 16:46:11 slinky user.warn kernel:          cdb 12 00 00 00 60 00 
00 00  00 00 00 00 00 00 00 00
Feb 28 16:46:11 slinky user.warn kernel:          res 
40/00:02:00:24:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 28 16:46:11 slinky user.err kernel: ata1.00: status: { DRDY }
Feb 28 16:46:11 slinky user.info kernel: ata1: soft resetting link
Feb 28 16:46:11 slinky user.info kernel: ata1.00: configured for UDMA/33
Feb 28 16:46:11 slinky user.info kernel: ata1: EH complete
Feb 28 16:46:11 slinky user.warn kernel: ata1.00: limiting speed to PIO4
Feb 28 16:46:11 slinky user.err kernel: ata1.00: exception Emask 0x0 
SAct 0x0 SErr 0x0 action 0x6 frozen
Feb 28 16:46:11 slinky user.err kernel: ata1.00: cmd 
a0/01:00:00:60:00/00:00:00:00:00/a0 tag 0 dma 96 in
Feb 28 16:46:11 slinky user.warn kernel:          cdb 12 00 00 00 60 00 
00 00  00 00 00 00 00 00 00 00
Feb 28 16:46:11 slinky user.warn kernel:          res 
40/00:02:00:24:00/00:00:00:00:00/a0 Emask 0x4 (timeout)
Feb 28 16:46:11 slinky user.err kernel: ata1.00: status: { DRDY }
Feb 28 16:46:11 slinky user.info kernel: ata1: soft resetting link
Feb 28 16:46:11 slinky user.info kernel: ata1.00: configured for PIO4
Feb 28 16:46:11 slinky user.info kernel: ata1: EH complete
Feb 28 16:46:11 slinky user.info kernel: scsi scan: 96 byte inquiry 
failed.  Consider BLIST_INQUIRY_36 for this device
Feb 28 16:46:11 slinky user.notice kernel: scsi 0:0:0:0: CD-ROM 
    HL-DT-ST DVD-RAM GH22NP20 1.02 PQ: 0 ANSI: 5
Feb 28 16:46:11 slinky user.info kernel: ACPI: PCI Interrupt 
0000:00:14.2[A] -> GSI 16 (level, low) -> IRQ 16



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