man rendition (Fichiers spéciaux) - Rendition video driver


rendition - Rendition video driver


Section qDeviceq
  Identifier qdevnameq
  Driver qrenditionq


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.


The rendition driver supports PCI and AGP video cards based on the following Rendition/Micron chips:

Verite V1000 based cards.
Verite V2100 based cards. Diamond Stealth II S220 is the only known such card.
Verite V2200 based cards.


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 qDeviceq 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 qDeviceq section.

The following driver Options are supported:

Option qSWCursorq qbooleanq
Disables use of the hardware cursor. Default: use HW-cursor.
Option qOverclockMemq qbooleanq
Increases the Mem/Sys clock to 125MHz/60MHz from standard 110MHz/50MHz. Default: Not overclocked.
Option qDacSpeedq qMHzq
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 qFramebufferWCq qbooleanq
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 qNoDDCq qbooleanq
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 Xorg. Default: Probe DDC.
Option qShadowFBq qbooleanq
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 qRotateq qCWq
Option qRotateq qCCWq
Rotate the display clockwise or counterclockwise. This mode is unaccelerated. Default: no rotation.




Authors include: Marc Langenbach, Dejan Ilic

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 qMTRRq to let the driver request write-combining of memory access on the video board.