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ATI Radeon CrossFire On Linux

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  • #16
    AFAIK Crossfire is only enabled for specific apps

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    • #17
      Hello bridgman. If crossfire support is enabled succesfully, will there be any "Crossfire Enabled" message in /var/log/Xorg.0.log?.

      I still get following messages in my /var/log/Xorg.0.log in both Gentoo X86_64 and Ubuntu interpid X86:
      Code:
      (II) fglrx(0): ATI Video BIOS revision 9 or later detected
      (II) fglrx(0): MultiAsic found: Check whether two adapters have the same configu
      ration
      (II) fglrx(0): ATI Video BIOS revision 9 or later detected
      (II) fglrx(0): MultiAsic found: Check whether two adapters have the same configu
      ration
      (II) fglrx(0): ATI Video BIOS revision 9 or later detected
      (II) fglrx(0): MultiAsic found: Check whether two adapters have the same configu
      ration
      (II) fglrx(0): ATI Video BIOS revision 9 or later detected
      (II) fglrx(0): MultiAsic found: Check whether two adapters have the same configu
      ration
      (EE) fglrx(0): Can't downgrade to required crossfire configuration, disable CF
      aticonfig --lsa does show that there are 2 4870 gpu in my system.
      Code:
      octapult@octapult-desktop:~$ aticonfig --lsa
      * 0. 03:00.0 ATI Radeon HD 4870 X2
        1. 04:00.0 ATI Radeon HD 4870 X2
      
      * - Default adapter
      This is what I get when I enter "aticonfig --lscc":
      Code:
      Master adapter:  0. 03:00.0 ATI Radeon HD 4870 X2
          Candidates:  none
      And there is no /dev/dri/card1 in my system:
      Code:
      octapult@octapult-desktop:~$ ls /dev/dri
      card0
      I can't get temperature of my 2nd gpu:
      Code:
      octapult@octapult-desktop:~$ aticonfig --adapter=1 --odgt
      ERROR - Get temperature failed for Adapter 1 - ATI Radeon HD 4870 X2
      I suppose those messages are indicating that the Crossfire support is not enabled and the 2nd gpu is not properly set up on my 4870x2?

      p.s. Crossfire does work fine in my Windows XP.

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      • #18
        Not sure but will ask. Your first question pretty much exhausted everything I know about Crossfire on Linux

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        • #19
          Brigman, I read in http://www.hardwaresecrets.com/article/391/5 that exists several ways of crossfire working, is that the cause of crossfire being only available to a certain application (since load balancing must be calculated)? Or is that because of application specific hacks that the drivers have?

          Wikipedia says that ATI Crossfire does have a "dumb" mode (The scissor one) that splits each frame in half in case Catalyst doesn't have a profile for the game. Which mode is implemented in FGLRX? There is a any roadmap for full app support for crossfire in Linux?

          Thx in advance.

          Sorry for all the questions, but I really would love to understand what is behind Crossfire, since as a Programmer I doesn't see what is the problem of creating Crossfire support in a driver, but, as outsider there must be something that I don't know and AMD Engeeniers do know better that me!

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