docs/envvars.html

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   7 <H1>Environment Variables</H1>
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  10 Mesa supports the following environment variables:
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  12 <ul>
  13 <li>MESA_DEBUG - if defined, error messages are printed to stderr
  14 <li>MESA_NO_DITHER - disable dithering, overriding glEnable(GL_DITHER)
  15 <li>MESA_RGB_VISUAL - specifies the X visual and depth for RGB mode (X only)
  16 <li>MESA_CI_VISUAL - specifies the X visual and depth for CI mode (X only)
  17 <li>MESA_BACK_BUFFER - specifies how to implement the back color buffer (X only)
  18 <li>MESA_PRIVATE_CMAP - force aux/tk libraries to use private colormaps (X only)
  19 <li>MESA_GAMMA - gamma correction coefficients (X only)
  20 <li>MESA_XSYNC - enable synchronous X behavior (for X debugging only)
  21 </ul>
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