xxxzc/modifyedid.py

## modifyedid.py
# Modify laptop 4k panel edid for big sur
# This will make panel running at 48Hz
# Created by xxxzc
# Reference: http://bbs.pcbeta.com/forum.php?mod=viewthread&tid=1866466&highlight=edid
from subprocess import check_output
from base64 import b64encode
from textwrap import wrap

edid = ''
try:
    edid = check_output('ioreg -lw0 | grep -i "IODisplayEDID"',
                            shell=True, encoding='utf-8')
    edid = edid.split('<')[1].split('>')[0]
except Exception:
    edid = input('No edid found, please input it manually: ')

edid = wrap(''.join(filter(str.isalnum, edid)), 2) # convert to 128 bytes

print('Default EDID:', ''.join(edid))

# set refresh rate to 48Hz
if len(edid) == 128:
    edid[54] = edid[55] = 'a6' # Descriptor 1
elif len(edid) == 256:
    edid[54] = edid[55] = 'a6' # Descriptor 1
    edid[72] = edid[73] = 'a6' # Descriptor 2

data = list(int(x, 16) for x in edid)

csb = 127 # checksum byte
checksum = 256 - sum(data[:csb]) % 256

edid[csb] = hex(checksum)[2:]
print('Patched EDID:', ''.join(edid))

data[csb] = checksum
data = b64encode(bytes(data)).decode('utf-8')
print()
print('You should add following to PciRoot(0x0)/Pci(0x2,0x0):')
print('<key>AAPL00,override-no-connect</key>')
print(f'<data>{data}</data>')
	# Modify laptop 4k panel edid for big sur
	# This will make panel running at 48Hz
	# Created by xxxzc
	# Reference: http://bbs.pcbeta.com/forum.php?mod=viewthread&tid=1866466&highlight=edid
	from subprocess import check_output
	from base64 import b64encode
	from textwrap import wrap

	edid = ''
	try:
	edid = check_output('ioreg -lw0 \| grep -i "IODisplayEDID"',
	shell=True, encoding='utf-8')
	edid = edid.split('<')[1].split('>')[0]
	except Exception:
	edid = input('No edid found, please input it manually: ')

	edid = wrap(''.join(filter(str.isalnum, edid)), 2) # convert to 128 bytes

	print('Default EDID:', ''.join(edid))

	# set refresh rate to 48Hz
	if len(edid) == 128:
	edid[54] = edid[55] = 'a6' # Descriptor 1
	elif len(edid) == 256:
	edid[54] = edid[55] = 'a6' # Descriptor 1
	edid[72] = edid[73] = 'a6' # Descriptor 2

	data = list(int(x, 16) for x in edid)

	csb = 127 # checksum byte
	checksum = 256 - sum(data[:csb]) % 256

	edid[csb] = hex(checksum)[2:]
	print('Patched EDID:', ''.join(edid))

	data[csb] = checksum
	data = b64encode(bytes(data)).decode('utf-8')
	print()
	print('You should add following to PciRoot(0x0)/Pci(0x2,0x0):')
	print('<key>AAPL00,override-no-connect</key>')
	print(f'<data>{data}</data>')