The tda9887 chip is Philips' I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio chip, which means it extracts various formats of audio from an input signal. The tda9887 configuration is a source of many audio problems on both NTSC and PAL systems using the PVR-150 or PVR-500 capture card. A misconfigured tda9887 may be identified by: -- Missing audio on all channels -- Missing audio on some channels -- Audio accompanied by a high frequency tone -- "Staticy" audio on all channels -- "Crackley" audio on all channels -- Staticy and Crackley audio on some channels and missing audio on others -- An overwhelming sense of frustration Q1. How do I know if I have a tda9887 chip on my card? A1. You can look at the card and phyisically look for it, usually a 32-pin square surface-mount component 5mm on each side or a 24-pin rectangle between 5.3-7.5mm. An easier way however is to probe it. Once ivtv is loaded, simply modprobe tda9887. If you see a line in your dmesg output like: tda9885/6/7: chip found @ 0x43 You've got one, congratulations! Q2. What are the module parameters to the tda9887? A1. debug - integer 0 (default) - no debug messages 1 - debug messages for commands 2 - report status after commands (kernel 2.6.8 or above) port1 - integer flag - Disable port1 output 0 - port1 output enabled 1 (default) - port1 output disabled port2 - integer flag - Disable port2 output 0 - port2 output enabled 1 (default) - port2 output disabled qss - integer flag - Force quasi split sound mode unset (default) - use default for selected audio format 0 - force intercarrier mode 1 - force QSS mode adjust - integer - Tuner takeover point adjustment 0x1f - +15dB 0x10 (default) - +0dB 0x00 - -16dB pal - string - Select PAL region b - B - g - G - Select PAL-B/G i - I - Select PAL-I d - D - k - K - Select PAL-DK secam - string - Select SECAM region d - D - k - K - Select SECAM-DK l - L - Select SECAM-L Q3. Wow, I have no idea what you just said there. What module parameters are needed for *my* card? A3. Depends on your card. At the *very* least, you need to specify your audio standard if you're in PAL or SECAM land. For example, in PAL-DK: options tda9887 pal=k On an unrelated note, you'll want to specify this for your tuner too: options tuner pal=k Q4. What do I do still don't have sound, or only some channels have sound? A4. If you've already specified your PAL/SECAM flavor, the problem might be a disabled port is needed. Some cards require their output ports be enabled in order to produce sound. Note that the port flags are inverted, so to enabled both output ports you need: options tda9887 port1=0 port2=0 [pal/secam selector] Some people have reported success with only one port activated, so it may be beneficial to try each port separately if switching them both on doesn't work for you. Q5. What was the old "black magic" patch or "no_black_magic" module parameter do, and why isn't it around any more? A5. In early development of the cx25840 driver, there was an unkown I2C transfer which made the audio work for the PAL-land developer. Since it was unknown what this data was, it was added as a raw I2C write in the cx25840 driver. Later, it was determined that this was the configuration of the tda9887 chip and the module was included into the ivtv project. The code to do the mystery initialization was removed from the cx25840 driver (since it it didn't belong there anyway). For the record, the black magic code initialized the chip the same as the module parameters "pal=i port1=0 port2=0" do.