sabre.py

#!/usr/bin/env python2

import os
import struct
from fcntl import ioctl

def __ioctl_val(val):
  # workaround for OverFlow bug in python 2.4
  if val & 0x80000000:
    return -((val^0xffffffff)+1)
  return val

IOCTL_INFO = __ioctl_val(0x80dc4801)
IOCTL_PVERSION = __ioctl_val(0x80044810)
IOCTL_VERB_WRITE = __ioctl_val(0xc0084811)

def set(nid, verb, param):
  verb = (nid << 24) | (verb << 8) | param
  res = ioctl(FD, IOCTL_VERB_WRITE, struct.pack('II', verb, 0))  

FD = os.open("/dev/snd/hwC0D0", os.O_RDONLY)
info = struct.pack('Ii64s80si64s', 0, 0, '', '', 0, '')
res = ioctl(FD, IOCTL_INFO, info)
name = struct.unpack('Ii64s80si64s', res)[3]
if not name.startswith('HDA Codec'):
  raise IOError("unknown HDA hwdep interface")
res = ioctl(FD, IOCTL_PVERSION, struct.pack('I', 0))
version = struct.unpack('I', res)
if version < 0x00010000:	# 1.0.0
  raise IOError("unknown HDA hwdep version")

# initialization sequence starts here...

set(0x1b, 0x707,   0x24) # 0x1b070724 (SET_PIN_WIDGET_CONTROL)

os.close(FD)