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Save xxxzc/032bf9eef2f217bc7d60f087e25555e1 to your computer and use it in GitHub Desktop.
# 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>') |
Patch is working for Dell XPS 2020 4k
Can you share your lines? I was generated for myself but boot process stuck.
Look into my repo and description.
Look into my repo and description.
Doesn't work for XPS 17 for some reason. My EDID is 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
, after patch data looks like this AP///////wBNENYUAAAAAAUeAQS1JRd4CtTGqlMzuiQMUFUAAAABAQEBAQEBAQEBAQEBAQEBpqYAoPBgRZAwIDYAbuUQAAAYKLkAoPBgRZAwIDYAbuUQAAAYAAAA/gA3SlhLOIBMUTE3MFIxAAAAAAACQQMyARIAAAsBCiAgAYECAw8A4wWAAOYGBQFgYCgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAtw==
and if I apply this system won't boot - freezes before desktop should appear.
@khmyznikov I updated my script to support 256 bytes EDID , please try this:
patch descriptor 1 and descriptor 2 to 48Hz:
AP///////wBNENYUAAAAAAUeAQS1JRd4CtTGqlMzuiQMUFUAAAABAQEBAQEBAQEBAQEBAQEBpqYAoPBgRZAwIDYAbuUQAAAYpqYAoPBgRZAwIDYAbuUQAAAYAAAA/gA3SlhLOIBMUTE3MFIxAAAAAAACQQMyARIAAAsBCiAgASMCAw8A4wWAAOYGBQFgYCgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAqg==
or patch descriptor 2 only
AP///////wBNENYUAAAAAAUeAQS1JRd4CtTGqlMzuiQMUFUAAAABAQEBAQEBAQEBAQEBAQEBcucAoPBgRZAwIDYAbuUQAAAYpqYAoPBgRZAwIDYAbuUQAAAYAAAA/gA3SlhLOIBMUTE3MFIxAAAAAAACQQMyARIAAAsBCiAgARYCAw8A4wWAAOYGBQFgYCgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAqg==
or patch descriptor 1 only:
AP///////wBNENYUAAAAAAUeAQS1JRd4CtTGqlMzuiQMUFUAAAABAQEBAQEBAQEBAQEBAQEBpqYAoPBgRZAwIDYAbuUQAAAYKLkAoPBgRZAwIDYAbuUQAAAYAAAA/gA3SlhLOIBMUTE3MFIxAAAAAAACQQMyARIAAAsBCiAgAY4CAw8A4wWAAOYGBQFgYCgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAqg==
can you confirm this is your internal panel's EDID? 256 bytes EDID is normally found on external display.
@xxxzc @thefiredragon yes I confirm - it's 256. So with WEG 1.4.5 and with any of three strings from @xxxzc i got same result - screen recognized as 4k and show image, but very very glitchy like every third row of pixels was stolen and image constantly shake and jump. @thefiredragon I used your config and there is already no enable-dpcd-max-link-rate option, only enable-dpcd-max-link-rate-fix.
please provide on my repo your efi, I could take a look
please provide on my repo your efi, I could take a look
It's all your repo copy pasted, just changed override to first one from @xxxzc post
New WEG version fixed this problem
Good to hear