I've just acquired a Nova-T USB model 908. I built the additional modules for
it for my current kernel (2.6.12.5) on my vdr box, and the usb device is
detected and hotplug loads the correct modules.
All looks great until I try to stream data from the card and watch it from
vdr: it seems to be dropping almost alternate frames! dmesg gives me a
continual stream of:
ttusb_process_muxpack: cc discontinuity (1 frames missing)
ttusb_process_muxpack: muxpack with incorrect checksum, ignoring
ttusb_process_muxpack: cc discontinuity (1 frames missing)
ttusb_process_muxpack: muxpack with incorrect checksum, ignoring
ttusb_process_muxpack: cc discontinuity (1 frames missing)
ttusb_process_muxpack: muxpack with incorrect checksum, ignoring
ttusb_process_frame: lost sync.
ttusb_process_muxpack: cc discontinuity (2 frames missing)
ttusb_process_muxpack: muxpack with incorrect checksum, ignoring
ttusb_process_muxpack: cc discontinuity (1 frames missing)
ttusb_process_muxpack: muxpack with incorrect checksum, ignoring
ttusb_process_frame: lost sync.
Which doesn't look particularly healthy!
This is on a Via Epia board with a PCI Nova-T as well, and using softdevice
output with DirectFB.
In its wisdom, it has assigned the USB device, the framebuffer, and the
on-board sound to the same IRQ:
CPU0
0: 1918588 XT-PIC timer
1: 553 XT-PIC i8042
2: 0 XT-PIC cascade
5: 936280 XT-PIC viafb, uhci_hcd:usb2, uhci_hcd:usb4, VIA8233,
eth0
8: 4 XT-PIC rtc
9: 406150 XT-PIC ehci_hcd:usb1, cx88[0], uhci_hcd:usb3, cx88
[0]
12: 113 XT-PIC i8042
14: 38380 XT-PIC ide0
NMI: 0
LOC: 0
ERR: 0
MIS: 0
Is this likely to be a problem down to not enough interrupts, or is this a
driver problem? I do have a 2.6.14 kernel to test but I never managed to get
the /dev/input/eventx to appear for the remote on the other DVB card with
that kernel!
I did originally try two PCI DVB cards with an active riser (only one PCI
slot) but that just couldn't cope!
Cheers,
Laz
