DLP setting finder

import subprocess, re

def _getDLP():
    p = subprocess.Popen(['nvidia-xconfig', '--query-gpu-info'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate()
    if err:
        return
    out = out.split('\n')
    for l in out:
        if 'Panasonic' in l:
            i = out.index(l)
            dfpLine = out[i-1]
            findDfp = re.search('DFP-[\d]', dfpLine)
            if findDfp:
                return findDfp.group()

# alt method:
def getDLP():
    xorgLog = '/var/log/Xorg.0.log'
    if os.path.exists(xorgLog):
        fd = open(xorgLog, 'r')
        for line in fd:
            # the idea here is that '(connected)' is not the primary display
            # primary is '(boot, connected)',
            # so this one is the presentation display
            if '(connected)' in line:
                findDfp = re.search('DFP-[\d]', line)
                if findDfp:
                    fd.close()
                    return findDfp.group()
        fd.close()
    else:
        return _getDLP()