NAME
ifb – inextricable frame buffer
SYNOPSIS
ifb* at pci? wsdisplay* at ifb?
DESCRIPTION
The ifb driver attempts to support various frame buffer cards based on the 3DLabs ‘Wildcat’ chips, such as the Sun Expert3D-Lite, Expert3D, XVR-500, XVR-600 and XVR-1200 boards. It does not provide direct device driver entry points but makes its functions available via the internal wsdisplay(4) interface.
DISPLAY RESOLUTION
If the ifb frame buffer is used as the console display, a different resolution than the default 1152x900 can be selected by changing the OpenPROM environment. To change the default resolution, type the following:
ok setenv output-device screen:r1280x1024x76
to change to a 76Hz 1280x1024 resolution.
The ifb frame buffer accepts the following resolutions:
| Mode | Resolution | Refresh | |
| Identifier | Rate (Hz) | ||
| r640x480x60 | 640x480 | 60 | |
| r640x480x60i | 640x480 | 60 | Composite sync |
| r768x575x50i | 768x575 | 50 | |
| r1024x768x60 | 1024x768 | 60 | Composite sync |
| r1024x768x70 | 1024x768 | 70 | |
| r1024x768x75 | 1024x768 | 75 | |
| r1024x768x77 | 1024x768 | 77 | |
| r1024x800x84 | 1024x800 | 84 | Composite sync |
| r1152x900x66 | 1152x900 | 66 | Composite sync |
| r1152x900x76 | 1152x900 | 76 | Composite sync |
| r1280x800x76 | 1280x1024 | 76 | |
| r1280x1024x60 | 1280x1024 | 60 | |
| r1280x1024x67 | 1280x1024 | 67 | Composite sync |
| r1280x1024x75 | 1280x1024 | 75 | |
| r1280x1024x76 | 1280x1024 | 76 | Composite sync |
| r1280x1024x85 | 1280x1024 | 85 | |
| r1440x900x76 | 1440x900 | 76 | Composite sync |
| r1600x1000x66 | 1600x1000 | 66 | |
| r1600x1000x76 | 1600x1000 | 76 | Composite sync |
| r1600x1280x76 | 1600x1280 | 76 | |
| r1792x1344x75 | 1792x1344 | 75 | |
| r1920x1080x72 | 1920x1080 | 72 | Composite sync |
| r1920x1200x70 | 1920x1200 | 70 | |
| r1920x1200x75 | 1920x1200 | 75 |
Modes with the suffix letter ‘i’ are interlaced.
SEE ALSO
BUGS
The second head of XVR-1200 cards is not supported.