capture of camera often fails to work

[Dirk L. <dir...@gm...>]

Hi everybody,

A friend of mine tries to attach his (Sony) camera to a NEC uPD72874 firewire 
card. Sometimes the captures works, most of the time the control of camera and 
firewire interface for whatever reason fails to work correctly.

dmesg throughs out the messages:
[  424.051551] firewire_ohci: isochronous cycle inconsistent
[  480.812183]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  480.812210]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]

Has anybody seen error messages like that and know what this might cause? How 
to get around this problem?

Thanks, 
	Dirk



Kernel 3.0.0, Linux Mint 12
libraw1394 2.0.7

 ~ $ lspci | grep FireWire
04:06.0 FireWire (IEEE 1394): NEC Corporation uPD72874 IEEE1394 OHCI 1.1 3-ort 
PHY-Link Ctrlr (rev 01)

 ~ $ lsmod | grep fire
firewire_ohci 40722 0
firewire_core 63626 1 firewire_ohci
crc_itu_t 12707 1 firewire_core

 ~ $ ls -l /dev/fw*
crw-------  1 root root  251, 0 2012-08-04 15:22 /dev/fw0
crw-rw----+ 1 root video 251, 1 2012-08-04 15:24 /dev/fw1
 ~ $ dmesg | grep firewire
[    2.028465] firewire_ohci 0000:04:06.0: PCI INT A -> GSI 21 (level, low) -> 
IRQ 21
[    2.084103] firewire_ohci: Added fw-ohci device 0000:04:06.0, OHCI v1.10, 4 
IR + 4 IT contexts, quirks 0x1
[    2.584242] firewire_core: created device fw0: GUID 00004c010000404f, S400
[   95.874456] firewire_core: skipped bus generations, destroying all nodes
[   96.372150] firewire_core: rediscovered device fw0
[   96.481178] firewire_core: created device fw1: GUID 08004601012fa403, S100
[   96.481187] firewire_core: phy config: card 0, new root=ffc1, gap_count=5
[   96.481427] firewire_core: skipped bus generations, destroying all nodes
[   96.980085] firewire_core: rediscovered device fw0
[   97.088906] firewire_core: rediscovered device fw1
[   97.097512] firewire_ohci: isochronous cycle inconsistent
[  360.812159]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  360.812190]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  424.051551] firewire_ohci: isochronous cycle inconsistent
[  480.812183]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  480.812210]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  600.812214]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  600.812241]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  600.812422]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  600.812445]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  720.812198]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  720.812225]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  720.812406]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  720.812429]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  840.812189]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  840.812216]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  840.812396]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  840.812419]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  960.812219]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  960.812246]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]
[  960.812428]  [<ffffffffa0074f50>] ? ioctl_get_speed+0x20/0x20 [firewire_core]
[  960.812451]  [<ffffffffa0076eb5>] fw_device_op_release+0x1a5/0x270 
[firewire_core]