https://bugs.freedesktop.org/show_bug.cgi?id=106053
--- Comment #1 from Hi-Angel Hi-Angel@yandex.ru --- Can't comment on the rest, but
And small question. Why Max core profile shows 0.0? Should I open another bug-report?
This is because the OpenGL version r300g supports didn't have the separation to core/compat profile. See also this comment https://bugs.freedesktop.org/show_bug.cgi?id=103506#c8