VOODOO(4) Kernel Interfaces Manual VOODOO(4)
voodoo - Voodoo video driver
voodoo is an Xorg driver for Voodoo 1 and Voodoo 2 series video
adapters. On the Voodoo 1 the driver uses a shadow buffer in system
memory as the video adapter has only 3D acceleration. Selected portions
of the shadow framebuffer are copied out to the Voodoo board at the
right time. Because of this, the speed of the driver is very dependent
on the CPU. Processors nowadays are actually rather fast at moving data
so we get very good speed anyway as the shadow framebuffer is in cached
The Voodoo2 has 16bpp acceleration and the driver provides accelerated
versions of most operations except angled lines and stipples. Acceler-
ated alpha blending with the Render extension is also supported as is
This driver supports 16bpp modes currently. The video hardware supports
image conversion from 24bpp to 16bpp but the hardware is 16bpp only.
The Voodoo 1 series cards can go up to 800x600 resolution while the
Voodoo 2 can reach 1024x768 providing it has at least 2Mb of frame buf-
fer memory. 1024x768 2D mode does not require two cards configured in
scan-line interleave mode (SLI).
Multihead and Xinerama configurations are supported. SLI configurations
will be treated as multiple video cards.
Limited support for DPMS screen saving is available. The "standby" and
"suspend" modes are just painting the screen black. The "off" mode
turns the Voodoo board off and thus works correctly.
This driver does not support a virtual screen size different from the
display size. This is a hardware limitation. 3D rendering is also not
Please refer to xorg.conf(5) for general configuration details. This
section only covers configuration details specific to this driver.
The following driver Options are supported:
Option "ShadowFB" "boolean"
Enables a shadow buffer in main memory. This turns off accelera-
tion but for otherwise unaccelerated operations can improve per-
formance materially. Default: off for voodoo2, on for voodoo1.
Option "NoAccel" "boolean"
Disables acceleration if set. Unless debugging this option
should only be set if ShadowFB is enabled. Default: off for
voodoo2, on for voodoo1.
The driver interacts badly with the sstfb frame buffer driver as there
is insufficient information to restore the chip to its previous state.
Xorg(1), xorg.conf(5), xorgconfig(1), Xserver(1), X(7)
Authors: Alan Cox, Ghozlane Toumi, Henrik Harmsen.
X Version 11 xf86-video-voodoo 1.2.0 VOODOO(4)