Information for Rendition Users : XF86Config Option
Previous: Features
Next: News in this release

5. XF86Config Option

Option "sw_cursor"

Disables use of the hardware cursor.

Option "overclock_mem"

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.

DacSpeed "MHz"

Set custom ramdac limit. We have currently no way of knowing if the v2x00 chip is a v2100 (170MHz) or v2200 (203MHz and 230MHz) so we assume the lowest. Use this option to manually override the value.

Option "FramebufferWC"

If writecombine is disabled in BIOS, and you add this option in 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.

Option "NoDDC"

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.

Option "ShadowFB"

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.

Option "Rotate"

The option expect a value "CW" for clockwise or "CCW" for counterclockwise rotation of the screen. This is useful when you need more height then width on the screen. Desktop publishing is one example where a monitor could display the whole page at once on a monitor laying on the side. Notice that this option requires "ShadowFB" and automatically enable it. It also disables the acceleration. The option is not activated by default.

Information for Rendition Users : XF86Config Option
Previous: Features
Next: News in this release