NAME

       oss_ich - Intel ICH/SiS7012/Nvidia/AMD audio device driver.

DESCRIPTION

       Open Sound System driver for Intel ICH, nVidia Nforce, AMD and SiS 7012 devices.

OPTIONS

       •  intelpci_rate_tuning=<NNN>  (default  is  240)  Some  Compaq  Deskpro  models (EN and EX at least) and
          certain Dell models play and record audio at a higher speed than what is  expected.  If  you  have  an
          Intel815 motherboard with an AD1885 you can try setting the parameter to 240, 280 or 330 and see which
          works  for  your  system.  The way to figure out the the right intelpci_rate_tuning value is using the
          osstest application.  It reports a sample rate drift value ("Sample rate  drift"  or  "srate  drift").
          Use the following formula (round the result to the nearest integer):

          <intelpci_rate_tuning = (240*(drift+100))/100>

       •  intelpci_force_mmio=<0|1>  (default  is  0=Disable) This option can be used to force the ICH4/ICH5 and
          ICH6 controllers to run in memory mapped mode to free up I/O address space.

       •  ich_jacksense=<0|1> (default is 0) Force use of jacksensing on some AD198x mixers.

FILES

       /etc/oss4/conf/oss_ich.conf
              Device configuration file.

AUTHOR

       4Front Technologies

                                                11 February 2015                                      oss_ich(7)