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Write monitor EDID to stdout with xrandr
#!/usr/bin/env python
import re
import subprocess
def get_edid_for_output(connector: str) -> bytes:
xrandr = subprocess.run(
['xrandr', '--props'],
check=True,
stdout=subprocess.PIPE,
)
lines = [b.decode('utf-8') for b in xrandr.stdout.split(b'\n')]
for i, line in enumerate(lines):
connector_match = re.match('^{} connected'.format(connector), line)
if connector_match:
for j in range(i + 1, len(lines)):
edid_match = re.match(r'\s*EDID:', lines[j])
if edid_match:
edid = ''
for k in range(j + 1, len(lines)):
if re.match(r'^\s*[0-9a-f]{32}$', lines[k]):
edid += lines[k].strip()
elif edid:
return bytes.fromhex(edid)
if __name__ == '__main__':
from sys import argv, stdout, exit
if len(argv) != 2:
from os.path import basename
exit('Usage: {} _OUTPUT_ > output.bin'.format(basename(argv[0])))
connector = argv[1]
edid = get_edid_for_output(connector)
if edid:
stdout.buffer.write(edid)
else:
exit('Could not find an EDID for output: {}'.format(connector))
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