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rendition - Rendition video driver
rendition is an XFree86 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.
The rendition driver supports PCI and AGP video cards based on the fol-
lowing 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.
Please refer to XF86Config(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:
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 dis-
play 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 write-
combined access to the framebuffer. This can drastically
increase the performance on unaccelerated server. Requires that
"MTRR"-support is compiled into the OS-kernel. Default: Dis-
abled 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. This might change before final XFree86 4.0 release.
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 sys-
tem 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 sys-
tems 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 prob-
lems with it. Use Option "MTRR" to let the driver request write-
combining of memory access on the video board.
XFree86(1), XF86Config(5), xf86config(1), Xserver(1), X(7)
Authors include: Marc Langenbach, Dejan Ilic
4.5.0 XFree86 RENDITION(4)