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Display corruption on initial start of X

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  • Display corruption on initial start of X

    I use Fedora 20. I have an HD7950 card driving three monitors. When using the open source AMD drivers with glamor acceleration, my X display is corrupted on first startup. It looks like this: http://imgur.com/PqOAGyB

    When I restart X (ctrl-alt-backspace), the system seems to "think" for a while (the monitors go into sleep mode), and then after a minute or so the display comes up fine. Subsequent restarts of X work fine as well.

    Here is the Xorg.0.log for the first (corrupted display) start: https://gist.github.com/rocketraman/9586629
    Here is the Xorg.0.log for the second (good display) start: https://gist.github.com/rocketraman/9586639

    The biggest diff between the two logs seems to be that on the first start there is some strange output for a "RADEON(G0)" which does not exist on the second log.

    With glamor acceleration disabled, the X server starts normally.

    Can anyone help?

    Current versions:

    Code:
    $ glxinfo | grep OpenGL
    OpenGL vendor string: X.Org
    OpenGL renderer string: Gallium 0.4 on AMD TAHITI
    OpenGL version string: 2.1 Mesa 10.0.3
    OpenGL shading language version string: 1.30
    OpenGL extensions:
    
    $ rpm -q xorg-x11-server-Xorg
    xorg-x11-server-Xorg-1.14.4-7.fc20.x86_64
    
    $ rpm -q xorg-x11-drv-ati
    xorg-x11-drv-ati-7.2.0-3.20131101git3b38701.fc20.x86_64
    
    $ rpm -q xorg-x11-glamor
    xorg-x11-glamor-0.5.1-3.20140115gitfb4d046c.fc20.x86_64
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