[mythtv-users] mythtv newbie needs help: ATI TV-wonder and bad visual quality

Elvis Chen chene77 at hotmail.com
Fri May 20 16:25:56 UTC 2005

hi all,

I just started playing around with mythtv using my spare computer parts.  I 
got everything working but suffer from bad visual quality.  I also have an 
audio-related problem.  I need your help.

First of all, here is my setup:

Asus A7S8X-MX (Sis chipset with onboard video 741GX)
     - Using X.org "sis" driver with Xv extension enabled
     - onboard sound is SoundMax, AC'97 driver
ATI TV-wonder (BT878)
     - co-axial cable (TV) input
     - internally I used a cdrom audio cable to connect the TV-audio output 
       the AUX audio input of the SoundMax
Suse 9.2
I'm watching/using MythTV on computer monitor.

First off, I installed MythTV 0.18 using the RPMs from:

I proceeded with mythtv-setup, using V4L as the video source.  After getting 
the channels setup (NTSC, us-cable), I can watch TV.  However,

1) I only get black and white TV images.  The on-screen caption generated by 
MythTV is in colour,
2) colour-aside, the quality of the image is just plain bad.  A lot of noise 
and flickers.  However, if I connect the co-axial cable to a regular TV, the 
images on TV is very sharp
3) I also have audio sync problem.  I played with kmix:  if I mute the "aux" 
input and enable recording on "aux" channel (as the FAQ suggested), I 
actually don't hear anything at all.
4) lastly, the MythTV screen is too big for my monitor:  looks like it isn't 
getting the screen geometry right and I lose about 1/5 of the mythtv screen. 
  So most of the time the buttons (say, during mythtv-setup) are not 

Any help is very much appreciated.  I have attached the dmesg portion 
regarding bttv below.


>dmesg|grep bt
bttv: driver version 0.9.15 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 2) at 0000:00:09.0, irq: 11, latency: 32, mmio: 0xed105000
bttv0: detected: ATI TV Wonder [card=63], PCI subsystem ID is 1002:0001
bttv0: using: ATI TV-Wonder [card=63,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=00ffffff [init]
i2c-algo-bit.o: bt878 #0 [sw] passed test.
bttv0: using tuner=19
bttv0: i2c: checking for MSP34xx @ 0x80... found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
tuner: chip found at addr 0xc0 i2c-bus bt878 #0 [sw]
tuner: type set to 19 (Temic PAL* auto (4006 FN5)) by bt878 #0 [sw]
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: PLL: 28636363 => 35468950 .. ok

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