Configuring the Video BIOS

Use CED to configure the VBIOS. Display settings will be used the same way as for the driver.

COMMON_TO_PORT

This setting allows you to associate standard display names used in most system BIOSs to specific ports that are recognized by Intel^® Embedded Media and Graphics Driver (e.g., LVDS, sDVO-B). The VBIOS makes this association when the VBIOS calls the System BIOS Intel^® 5F interrupt functions.

This setting is a six digit number, where each digit is associated with one of the system BIOS displays (from left to right):

1 : CRT - Standard analog CRT

2 : TV1 - TV Output 1

3 : EFP1 - DVI Flat Panel 1

4 : LFP - Local Flat Panel (Internal LVDS display)

5 : TV2 - TV Output 2

6 : EFP2 - DVI Flat Panel 2

The example values above show the typical displays and corresponding order used by a system BIOS. However, this may vary depending on how your system BIOS has implemented the displays and the Intel 5F interrupt functions.

The value in each setting associates with the port number. Using the typical settings above, set COMMON_TO_PORT to be 500400, if you want to associate CRT in the system BIOS with the internal CRT (port 5) and LFP in the system BIOS with internal LVDS (port 4) in the VBIOS.

Warning: This feature must be compatible with the system BIOS. If the system BIOS does not properly implement the Intel 5F functions, then using the COMMON_TO_PORT feature could cause unpredictable results with the displays. If you are unsure, set COMMON_TO_PORT to all zeros (000000) to disable this feature.

Note: The displaydetect parameter must be set to Enabled in order for the COMMON_TO_PORT values to be used.

post_display_msg

This setting is a binary setting that enables (1) or disables (0) POST messages to the display.

OEM Vendor Strings

The following settings are string values that allow you to set the values that are returned from the Intel 4F interrupt functions.

oem_string

oem_vendor_name

oem_product_name

oem_product_rev

Default Mode Settings

These settings establish the default VGA or VESA mode to use for the primary (0) and secondary (1) displays. The values should be set to a valid standard VGA or VESA mode (in hexadecimal format, for example, 0x117). Note that a VGA mode can only be set on one display and a second display is disabled unless the DisplayConfig parameter is set to clone mode.

default_mode_0

default_mode_1

Default Refresh Settings

These settings allow you to specify which refresh rate to use for certain VESA modes on the primary and secondary displays. For example, mode 0x117 specifies refresh rates of 60 Hz, 75 Hz, and 85 Hz. This setting allows use to specify which of those three rates to use (specified in decimal, e.g., default_refresh_0=60).

default_refresh_0

default_refresh_1

default_vga_height

This setting allows you to specify which resolution to use for certain VGA modes. Because only one VGA mode can be supported on both displays, this setting applies to the primary display mode (default_mode_0). For example, mode 3 specifies three possible resolutions: 640x200, 640x350, and 720x400. In this example, setting default_vga_height=350 indicates the resolution 640x350.