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rendition - Rendition video driver
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.
driver supports PCI and AGP video cards based on the following Rendition/Micron
Please refer to xorg.conf(5)
for general configuration
details. This section only covers configuration details specific to this
- Verite V1000 based cards.
- Verite V2100 based cards. Diamond
Stealth II S220 is the only known such card.
- Verite V2200 based cards.
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.
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"
- 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"
- 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"
- Option "Rotate" "CCW"
- Rotate the display clockwise or counterclockwise.
This mode is unaccelerated. Default: no rotation.
Authors include: Marc Langenbach,
- 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.
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