This is a known bug (http://ivtvdriver.org/trac/ticket/49). Read the
ticket for a temporary workaround. I'm working together with someone to
try and track down the cause. It may take awhile though.
Hans
On Sunday 19 March 2006 05:40, Kristo Kriechbaum wrote:
> I posted this to the users list last week but didn't get a response,
> I'm hoping someone here can help me out.
>
> I have a machine with 2 Avermedia M179's. I recently started getting
> these DMA errors, and when that happens, the video/audio from the
> card gets crappy: Mar 13 22:16:23 localhost kernel: ivtv0 warning:
> ENC: (0) DMA Error 0x0000000b Mar 13 22:32:00 localhost kernel: ivtv1
> warning: ENC: (0) DMA Error 0x0000000b Mar 13 22:32:30 localhost
> kernel: ivtv1 warning: ENC: (0) DMA Error 0x0000000b
>
> Artifacts appear in the video, and the audio gets kind of
> choppy/jumpy/poppy. I never have had these errors in the past, but I
> recently upgraded to a 64 bit processor, so I don't know if this is a
> hardware problem or a software problem (or a combination...)
>
> I pasted the pertinent contents of /var/log/messages below. I also
> have a sample of what the video is like when this happens at
> http://robotics.caltech.edu/~klk/zpublic/badvideo.mpg
>
> Machine info:
> Fedora Core 4 x86_64
> 2.6.15-1.1833_FC4
> ivtv 0.4.3-105.rhfc4.at
> Encoder revision: 0x02050032
> Decoder revision: 0x02020023
>
> Thanks for any help,
> Kristo
>
>
> -----------------------
> Mar 13 22:08:03 localhost kernel: ivtv: version 0.4.3 (tagged
> release) loading Mar 13 22:08:03 localhost kernel: ivtv: Linux
> version: 2.6.15-1.1833_FC4 gcc-4.0 Mar 13 22:08:03 localhost kernel:
> ivtv: In case of problems please include the debug info between Mar
> 13 22:08:03 localhost kernel: ivtv: the START INIT IVTV and END INIT
> IVTV lines, along with Mar 13 22:08:03 localhost kernel: ivtv: any
> module options, when mailing the ivtv-users mailinglist. Mar 13
> 22:08:03 localhost kernel: ivtv0: Autodetected AVerMedia M179 card
> (cx23415 based) Mar 13 22:08:03 localhost kernel: ACPI: PCI Interrupt
> Link [APC3] enabled at IRQ 18 Mar 13 22:08:03 localhost kernel: GSI
> 18 sharing vector 0xC1 and IRQ 18 Mar 13 22:08:03 localhost kernel:
> ACPI: PCI Interrupt 0000:02:08.0[A] -> Link [APC3] -> GSI 18 (level,
> low) -> IRQ 193 Mar 13 22:08:03 localhost kernel: ivtv0: Unreasonably
> low latency timer, setting to 64 (was 32) Mar 13 22:08:03 localhost
> kernel: tuner (ivtv): chip found at addr 0xc0 i2c-bus ivtv i2c driver
> #0 Mar 13 22:08:03 localhost kernel: All bytes are equal. It is not a
> TEA5767 Mar 13 22:08:03 localhost kernel: ivtv0: i2c attach to card
> #0 ok [client=(tuner unset), addr=60] Mar 13 22:08:03 localhost
> kernel: saa7115 2-0021: saa7114 found @ 0x42 (ivtv i2c driver #0) Mar
> 13 22:08:03 localhost kernel: ivtv0: i2c attach to card #0 ok
> [client=saa7114, addr=21] Mar 13 22:08:03 localhost kernel: ivtv0:
> Could not detect tuner standard, defaulting to NTSC. Mar 13 22:08:03
> localhost kernel: ivtv0: loaded v4l-cx2341x-enc.fw firmware (262144
> bytes) Mar 13 22:08:03 localhost kernel: ivtv0: loaded
> v4l-cx2341x-dec.fw firmware (262144 bytes) Mar 13 22:08:03 localhost
> kernel: ivtv0: Encoder revision: 0x02050032 Mar 13 22:08:03 localhost
> kernel: ivtv0: Decoder revision: 0x02020023 Mar 13 22:08:03 localhost
> kernel: ivtv0: Allocate DMA encoder MPEG stream: 128 x 32768 buffers
> (4096KB total) Mar 13 22:08:03 localhost kernel: ivtv0: Allocate DMA
> encoder YUV stream: 194 x 10800 buffers (2048KB total) Mar 13
> 22:08:03 localhost kernel: ivtv0: Allocate DMA encoder VBI stream:
> 120 x 17472 buffers (2048KB total) Mar 13 22:08:03 localhost kernel:
> ivtv0: Allocate DMA encoder PCM audio stream: 455 x 4608 buffers
> (2048KB total) Mar 13 22:08:03 localhost kernel: tuner: type set to 2
> (Philips NTSC (FI1236,FM1236 and compatibles)) by ivtv i2c driver #0
> Mar 13 22:08:03 localhost kernel: ivtv0: Initialized AVerMedia M179,
> card #0 Mar 13 22:08:03 localhost kernel: ivtv:
> ====================== NEXT CARD ====================== Mar 13
> 22:08:03 localhost kernel: ivtv1: Autodetected AVerMedia M179 card
> (cx23415 based) Mar 13 22:08:03 localhost kernel: ACPI: PCI Interrupt
> Link [APC2] enabled at IRQ 17 Mar 13 22:08:03 localhost kernel: GSI
> 19 sharing vector 0xC9 and IRQ 19 Mar 13 22:08:03 localhost kernel:
> ACPI: PCI Interrupt 0000:02:0a.0[A] -> Link [APC2] -> GSI 17 (level,
> low) -> IRQ 201 Mar 13 22:08:03 localhost kernel: ivtv1: Unreasonably
> low latency timer, setting to 64 (was 32) Mar 13 22:08:03 localhost
> kernel: tuner (ivtv): chip found at addr 0xc0 i2c-bus ivtv i2c driver
> #1 Mar 13 22:08:03 localhost kernel: All bytes are equal. It is not a
> TEA5767 Mar 13 22:08:03 localhost kernel: ivtv1: i2c attach to card
> #1 ok [client=(tuner unset), addr=60] Mar 13 22:08:03 localhost
> kernel: saa7115 3-0021: saa7114 found @ 0x42 (ivtv i2c driver #1) Mar
> 13 22:08:03 localhost kernel: ivtv1: i2c attach to card #1 ok
> [client=saa7114, addr=21] Mar 13 22:08:03 localhost kernel: ivtv1:
> loaded v4l-cx2341x-enc.fw firmware (262144 bytes) Mar 13 22:08:03
> localhost kernel: ivtv1: loaded v4l-cx2341x-dec.fw firmware (262144
> bytes) Mar 13 22:08:03 localhost kernel: ivtv1: Encoder revision:
> 0x02050032 Mar 13 22:08:03 localhost kernel: ivtv1: Decoder revision:
> 0x02020023 Mar 13 22:08:03 localhost kernel: ivtv1: Allocate DMA
> encoder MPEG stream: 128 x 32768 buffers (4096KB total) Mar 13
> 22:08:03 localhost kernel: ivtv1: Allocate DMA encoder YUV stream:
> 194 x 10800 buffers (2048KB total) Mar 13 22:08:03 localhost kernel:
> ivtv1: Allocate DMA encoder VBI stream: 120 x 17472 buffers (2048KB
> total) Mar 13 22:08:03 localhost kernel: ivtv1: Allocate DMA encoder
> PCM audio stream: 455 x 4608 buffers (2048KB total) Mar 13 22:08:03
> localhost kernel: tuner: type set to 2 (Philips NTSC (FI1236,FM1236
> and compatibles)) by ivtv i2c driver #1 Mar 13 22:08:03 localhost
> kernel: ivtv1: Initialized AVerMedia M179, card #1 Mar 13 22:08:03
> localhost kernel: ivtv: ==================== END INIT IVTV
> ====================
>
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