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bttv.o
        the bt848/878 (grabber chip) driver

        insmod args:
                card=n          card type, see CARDLIST for a list.
                tuner=n         tuner type, see CARDLIST for a list.
                radio=0/1       card supports radio
                pll=0/1/2       pll settings
                        0: don't use PLL
                        1: 28 MHz crystal installed
                        2: 35 MHz crystal installed

                triton1=0/1     for Triton1 (+others) compatibility
                vsfx=0/1        yet another chipset bug compatibility bit
                                see README.quirks for details on these two.

                bigendian=n     Set the endianness of the gfx framebuffer.
                                Default is native endian.
                fieldnr=0/1     Count fields.  Some TV descrambling software
                                needs this, for others it only generates
                                50 useless IRQs/sec.  default is 0 (off).
                autoload=0/1    autoload helper modules (tuner, audio).
                                default is 1 (on).
                bttv_verbose=0/1/2  verbose level (at insmod time, while
                                looking at the hardware).  default is 1.
                bttv_debug=0/1  debug messages (for capture).
                                default is 0 (off).
                irq_debug=0/1   irq handler debug messages.
                                default is 0 (off).
                gbuffers=2-32   number of capture buffers for mmap'ed capture.
                                default is 4.
                gbufsize=       size of capture buffers. default and
                                maximum value is 0x208000 (~2MB)
                no_overlay=0    Enable overlay on broken hardware.  There
                                are some chipsets (SIS for example) which
                                are known to have problems with the PCI DMA
                                push used by bttv.  bttv will disable overlay
                                by default on this hardware to avoid crashes.
                                With this insmod option you can override this.
                automute=0/1    Automatically mutes the sound if there is
                                no TV signal, on by default.  You might try
                                to disable this if you have bad input signal
                                quality which leading to unwanted sound
                                dropouts.
                chroma_agc=0/1  AGC of chroma signal, off by default.
                adc_crush=0/1   Luminance ADC crush, on by default.

                bttv_gpio=0/1
                gpiomask=
                audioall=
                audiomux=
                                See Sound-FAQ for a detailed description.

        remap, card, radio and pll accept up to four comma-separated arguments
        (for multiple boards).

tuner.o
        The tuner driver.  You need this unless you want to use only
        with a camera or external tuner ...

        insmod args:
                debug=1         print some debug info to the syslog
                type=n          type of the tuner chip. n as follows:
                                see CARDLIST for a complete list.
                pal=[bdgil]     select PAL variant (used for some tuners
                                only, important for the audio carrier).

tvmixer.o
        registers a mixer device for the TV card's volume/bass/treble
        controls (requires a i2c audio control chip like the msp3400).

        insmod args:
                debug=1         print some debug info to the syslog.
                devnr=n         allocate device #n (0 == /dev/mixer,
                                1 = /dev/mixer1, ...), default is to
                                use the first free one.

tvaudio.o
        new, experimental module which is supported to provide a single
        driver for all simple i2c audio control chips (tda/tea*).

        insmod args:
                tda8425  = 1    enable/disable the support for the
                tda9840  = 1    various chips.
                tda9850  = 1    The tea6300 can't be autodetected and is
                tda9855  = 1    therefore off by default, if you have
                tda9873  = 1    this one on your card (STB uses these)
                tda9874a = 1    you have to enable it explicitly.
                tea6300  = 0    The two tda985x chips use the same i2c
                tea6420  = 1    address and can't be disturgished from
                pic16c54 = 1    each other, you might have to disable
                                the wrong one.
                debug = 1       print debug messages

        insmod args for tda9874a:
                tda9874a_SIF=1/2        select sound IF input pin (1 or 2)
                                        (default is pin 1)
                tda9874a_AMSEL=0/1      auto-mute select for NICAM (default=0)
                                        Please read note 3 below!
                tda9874a_STD=n          select TV sound standard (0..8):
                                        0 - A2, B/G
                                        1 - A2, M (Korea)
                                        2 - A2, D/K (1)
                                        3 - A2, D/K (2)
                                        4 - A2, D/K (3)
                                        5 - NICAM, I
                                        6 - NICAM, B/G
                                        7 - NICAM, D/K (default)
                                        8 - NICAM, L

        Note 1: tda9874a supports both tda9874h (old) and tda9874a (new) chips.
        Note 2: tda9874h/a and tda9875 (which is supported separately by
        tda9875.o) use the same i2c address so both modules should not be
        used at the same time.
        Note 3: Using tda9874a_AMSEL option depends on your TV card design!
                AMSEL=0: auto-mute will switch between NICAM sound
                         and the sound on 1st carrier (i.e. FM mono or AM).
                AMSEL=1: auto-mute will switch between NICAM sound
                         and the analog mono input (MONOIN pin).
        If tda9874a decoder on your card has MONOIN pin not connected, then
        use only tda9874_AMSEL=0 or don't specify this option at all.
        For example:
          card=65 (FlyVideo 2000S) - set AMSEL=1 or AMSEL=0
          card=72 (Prolink PV-BT878P rev.9B) - set AMSEL=0 only

msp3400.o
        The driver for the msp34xx sound processor chips. If you have a
        stereo card, you probably want to insmod this one.

        insmod args:
                debug=1/2       print some debug info to the syslog,
                                2 is more verbose.
                simple=1        Use the "short programming" method.  Newer
                                msp34xx versions support this.  You need this
                                for dbx stereo.  Default is on if supported by
                                the chip.
                once=1          Don't check the TV-stations Audio mode
                                every few seconds, but only once after
                                channel switches.
                amsound=1       Audio carrier is AM/NICAM at 6.5 Mhz.  This
                                should improve things for french people, the
                                carrier autoscan seems to work with FM only...

tea6300.o - OBSOLETE (use tvaudio instead)
        The driver for the tea6300 fader chip.  If you have a stereo
        card and the msp3400.o doesn't work, you might want to try this
        one.  This chip is seen on most STB TV/FM cards (usually from
        Gateway OEM sold surplus on auction sites).

        insmod args:
                debug=1         print some debug info to the syslog.

tda8425.o - OBSOLETE (use tvaudio instead)
        The driver for the tda8425 fader chip.  This driver used to be
        part of bttv.c, so if your sound used to work but does not
        anymore, try loading this module.

        insmod args:
                debug=1         print some debug info to the syslog.

tda985x.o - OBSOLETE (use tvaudio instead)
        The driver for the tda9850/55 audio chips.

        insmod args:
                debug=1         print some debug info to the syslog.
                chip=9850/9855  set the chip type.