NAME
rendition - Rendition video driver
SYNOPSIS
Section "Device"
Identifier "devname"
Driver "rendition"
...
EndSection
DESCRIPTION
rendition is an Xorg driver for Rendition/Micron based video cards.
The driver supports following framebuffer depths: 8, 15 (Verite V1000
only), 16 and 24. Acceleration and multi-head configurations are not
supported yet, but are work in progress.
SUPPORTED HARDWARE
The rendition driver supports PCI and AGP video cards based on the
following Rendition/Micron chips:
V1000 Verite V1000 based cards.
V2100 Verite V2100 based cards. Diamond Stealth II S220 is the
only known such card.
V2200 Verite V2200 based cards.
CONFIGURATION DETAILS
Please refer to xorg.conf(5) for general configuration details. This
section only covers configuration details specific to this driver.
The driver auto-detects the chipset type, but the following ChipSet
names may optionally be specified in the config file "Device" section,
and will override the auto-detection:
"v1000", "v2x00".
The driver will auto-detect the amount of video memory present for all
chips. If the amount of memory is detected incorrectly, the actual
amount of video memory should be specified with a VideoRam entry in the
config file "Device" section.
The following driver Options are supported:
Option "SWCursor" "boolean"
Disables use of the hardware cursor. Default: use HW-cursor.
Option "OverclockMem" "boolean"
Increases the Mem/Sys clock to 125MHz/60MHz from standard
110MHz/50MHz. Default: Not overclocked.
Option "DacSpeed" "MHz"
Run the memory at a higher clock. Useful on some cards with
display glitches at higher resolutions. But adds the risk to
damage the hardware. Use with caution.
Option "FramebufferWC" "boolean"
If writecombine is disabled in BIOS, and you add this option in
configuration file, then the driver will try to request
writecombined access to the framebuffer. This can drastically
increase the performance on unaccelerated server. Requires that
"MTRR"-support is compiled into the OS-kernel. Default:
Disabled for V1000, enabled for V2100/V2200.
Option "NoDDC" "boolean"
Disable probing of DDC-information from your monitor. This
information is not used yet and is only there for informational
purposes. Safe to disable if you experience problems during
startup of X-server. Default: Probe DDC.
Option "ShadowFB" "boolean"
If this option is enabled, the driver will cause the CPU to do
each drawing operation first into a shadow frame buffer in
system virtual memory and then copy the result into video
memory. If this option is not active, the CPU will draw directly
into video memory. Enabling this option is beneficial for those
systems where reading from video memory is, on average, slower
than the corresponding read/modify/write operation in system
virtual memory. This is normally the case for PCI or AGP
adapters, and, so, this option is enabled by default unless
acceleration is enabled. Default: Enabled unless acceleration
is used.
Option "Rotate" "CW"
Option "Rotate" "CCW"
Rotate the display clockwise or counterclockwise. This mode is
unaccelerated. Default: no rotation.
Notes For the moment the driver defaults to not request write-combine
for any chipset as there has been indications of problems with
it. Use Option "MTRR" to let the driver request write-combining
of memory access on the video board.
SEE ALSO
Xorg(1), xorg.conf(5), Xserver(1), X(7)
AUTHORS
Authors include: Marc Langenbach, Dejan Ilic