I had similar issues with EDID on an old monitor. I pulled the cover off the back and found the I2C EEPROM that stored the EDID data. I soldered a jumper to dis

I had similar issues with EDID on an old monitor. I pulled the cover off the back and found the I2C EEPROM that stored the EDID data. I soldered a jumper to disable the write protect on the EEPROM and was able to reprogram it using the Linux i2c-dev device.