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0e1f616
(Get the code!)
I'm experiencing this same behaviour under Ubuntu Karmic 9.10 kernel 2.6.31-17-generic with a Prolink PixelView PlayTV MPEG2 PV-M4900 analog card and a ATI Radeon 9600 for video output. I've tried all sorts of configurations using bttv with different cards/tunners as well as several MythTV channel, Recording and Playback profiles configurations.
Here is my lspci with relevant stuff:
00:0e.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
00:0e.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 50)
01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AR [Radeon 9600]
01:00.1 Display controller: ATI Technologies Inc RV350 AR [Radeon 9600] (Secondary)
Here is my bttv output:
hlm@suite:~$ dmesg | grep bttv
[ 14.963747] bttv: driver version 0.9.18 loaded
[ 14.963756] bttv: using 8 buffers with 2080k (520 pages) each for capture
[ 14.963885] bttv: Bt8xx card found (0).
[ 14.963940] bttv 0000:00:0e.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 14.963958] bttv0: Bt878 (rev 17) at 0000:00:0e.0, irq: 17, latency: 32, mmio: 0xaf800000
[ 14.974167] bttv0: using: Prolink PixelView PlayTV MPEG2 PV-M4900 [card=139,insmod option]
[ 14.974178] IRQ 17/bttv0: IRQF_DISABLED is not guaranteed on shared IRQs
[ 14.974266] bttv0: gpio: en=00000000, out=00000000 in=00afc0ff [init]
[ 14.978467] bttv0: tuner type=59
[ 15.207477] bttv0: audio absent, no audio device found!
[ 15.400448] bttv0: registered device video0
[ 15.400503] bttv0: registered device vbi0
[ 15.400541] bttv0: registered device radio0
[ 15.400565] bttv0: PLL: 28636363 => 35468950 .. ok
[ 15.433360] input: bttv IR (card=139) as /devices/
[ 2784.539721] bttv0: PLL can sleep, using XTAL (28636363).
Only MythTV LiveTV and LiveTV recording are affected. TVTime, VLC, mplayer are working fine, which leads me into thinking MythTV is improperly initializing the video capture card.
There are all sorts of references out there on the web of people having this very same issue, none of them seem to be conclusive about a solution