UMx/Known Issues/Multistation Graphics and Video

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List of known Graphics and Video limitations of Multistation Computer Systems.


Contents

[edit] Graphics/Video Issues

[edit] 3D Acceleration is not supported on multiple video cards

Using multiple and/or dual-headed video cards in Linux prevents software such as video games from using 3D acceleration properly. This is not a Userful Multiplier specific issue, but a limitation of the Direct Rendering Infrastructure (DRI) within the current Linux X-server system. XFree86 does not support DRI acceleration on multiple video cards. XFree86 extensions not dependent on DRI should work; for example, 2D acceleration is supported.

[edit] Radeon 7000 videocards may not be compatible with 2.6 SMP Linux kernel

Certain combinations of Linux distributions and motherboards using the 2.6 SMP (Symmetric Multi-Processing) kernel have known issues with multiple Radeon 7000 cards. If you are using SMP with Radeon 7000 and encounter problems, we recommend switching to a non-SMP kernel. This is a bug with the Radeon driver and is not specific to Userful's software.

[edit] XVidMode extension not supported by some dual-head videocards

XVidMode is a small command-line application for switching X11 modes. Single-chip dual-head ATI video cards are not compatible with the XVidMode extension. XVidMode extension is disabled by default when using Userful Multiplier with such video cards

[edit] Single-User Mode Boots to Non-Graphical Interface on Some Linux Distros

The built-in X server on some Linux Distros (including but possibly not limited to Ubuntu 8.10) does not natively support multiple video cards and therefore does not support a GUI when multiple cards are installed. To work in single-user mode with a graphical user interface:

  • First, try rebuilding the x config file for your primary video card. Enter the commands below from the terminal, then reboot your system.
    • For NVIDIA cards using the NVIDIA proprietary driver, type this command: 
    nvidia-xconfig
    • For Radeon cards using the ATI proprietary driver, type this command: 
    aticonfig --initial
    • For other video cards, use: 
    Xorg -configure
  • If rebuilding the x-config file did not resolve the issue, unplug any extra video cards, then reboot your system.
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