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Modify the hardware ID (MON1234) to match that of the monitor being used. %MS_EDID_OVERRIDE%=MS_EDID_OVERRIDE,NTx86,NTamd64 Enable the following section to copy a monitor profile. Be sure to add the directive below with the proper catalog file after of any monitors, starting with Windows Vista.ĬlassGuid= This is a generic INF file for overriding EDIDs , 2Dįor more information on INFs in general, and AddReg and DDInstall in particular, see Creating an INF File. The monitor driver obtains blocks 1 - 3 and any extension blocks that follow block 5 from EEPROM: The following example shows the relevant sections of an INF that updates EDID blocks 0, 4, and 5. The system obtains the remaining blocks from EEPROM.

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Manufacturers must update only those EDID blocks that are incorrect. The "0x1" value after the block number is a flag indicating that this registry value contains binary data (FLG_ADDREG_BINVALUETYPE). The data bytes should be formatted as 128 hexadecimal integers that contain the binary EDID data. The block number is a zero-indexed value of the EDID block to override.

To override an EDID, include an AddReg directive in the INF for each block that you want to override, in the following format: HKR, EDID_OVERRIDE, BlockNumber, 0x1, Byte 1, Byte 2, Byte 3, Byte 4. Windows components and user-mode apps use the updated EDID info. EDID information that has been added to the registry always takes precedence over EEPROM EDID info. The monitor driver checks the registry during initialization and uses any EDID information that's stored there instead of the corresponding information on EEPROM. For example: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY\DELA007\ĥ&1608c50f&0&10000090&01&20\Device Parameters\EDID_Override The monitor class installer extracts the updated EDID information from the INF and stores the information as values under this registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAYĮach EDID override is stored under a separate key. This can be done through Windows Update or by shipping a CD with the monitor. The monitor manufacturer implements an INF that contains the updated EDID information and downloads the file to the user’s computer. The monitor driver obtains the updated data for the corrected blocks from the registry and uses the EEPROM data for the remaining blocks. To update EDID info, the manufacturer’s INF specifies the number of the block to be updated and provides 128 bytes of EDID data to replace the original block.

With EDID version 1.3 or enhanced EDID (E-EDID), manufacturers can specify one or more extension blocks in addition to the primary block.Įach block is numbered, starting with 0 for the initial block.

EDID version 1.0 through 1.2 consists of a single block of data, per the VESA specification.

EDID formatĮDID data is formatted as one or more 128-byte blocks: Guidelines for achieving this can be found in Monitor INF File Sections. Such an override is frequently made available to customers through Windows Update or digital media in the shipping box, and receives higher precedence than the EDID override mentioned here. In addition to replacing the EDID information, a vendor can provide an override for the monitor name and the preferred display resolution. Windows extracts the updated EDID information from the INF and provides it to components instead of using the EEPROM EDID information, effectively overriding the EEPROM EDID.

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The better solution, described here, is for the manufacturer to implement an INF file that contains the correct EDID info, and have the customer download it to the computer that is connected to the monitor.Have the customer send the monitor back to the manufacturer, who reflashes the EEPROM with the correct EDID and returns the monitor to the customer.There are two approaches to correcting EDIDs: Incorrect or invalid EDID information on the monitor’s EEPROM can therefore lead to problems such as setting incorrect display modes. For example, during initialization the monitor driver queries the Windows Display Driver Model (WDDM) driver for its brightness query interface and device driver interface (DDI) support, which is in the EDID. Monitors provide the EDID to Microsoft Windows components, display drivers, and some user-mode applications. This data is stored in the monitor’s EEPROM in a format that is specified by VESA. Approaches to correcting EDIDsĪll monitors, analog or digital, must support EDID, which contains information such as the monitor identifier, manufacturer data, hardware identifier, timing info, and so on.

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This topic describes how vendors and manufacturers can override the Extended Display Identification Data (EDID) of any monitor through an INF file, and provides a sample INF file ( Monsamp.inf).įor information on how to use and modify Monsamp.inf, see Monitor INF File Sections.