This can be reproduced on intel (and other cards that support GL_ARB_non_power_of_two) by launching unity with
MESA_EXTENSION_OVERRIDE=-GL_ARB_texture_non_power_of_two unity
Tormod, are you sure you aren't using r300g (that has limited NPOT support) instead of r300c?
This can be reproduced on intel (and other cards that support GL_ARB_ non_power_ of_two) by launching unity with
MESA_EXTENSION_ OVERRIDE= -GL_ARB_ texture_ non_power_ of_two unity
Tormod, are you sure you aren't using r300g (that has limited NPOT support) instead of r300c?