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[Bryce Harrington <685135@xxxxxxxxxxxxxxxxxx>]

The mesa error message for this is produced when mesa is given an
unsupported gl_format type.

   default:
      _mesa_problem(NULL, "bad format in _mesa_format_to_type_and_comps");
      *datatype = 0;
      *comps = 1;
   }

If someone could collect a full backtrace (gdb> bt full) with the mesa
debug package installed (libgl1-mesa-dri-dbg and/or libgl1-mesa-glx-dbg)
it might give a clue what format it's trying to use.

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https://bugs.launchpad.net/bugs/685135

Title:
  ALT+TAB makes unity crash (compiz: main/mipmap.c:43: bytes_per_pixel: Assertion `b >= 0' failed.)