I've found a related bug for the client side here:
https://bugs.freedesktop.org/show_bug.cgi?id=6689
Quote from the last comment:
"[snip] It's caused by the visual being marked
non-conformant by AIGLX. A solution is being discussed on the mesa3d-dev mailing
list.
Note that this is completely cosmetic and has no functional impact."
** Bug watch removed: Freedesktop Bugzilla #6624
https://bugs.freedesktop.org/show_bug.cgi?id=6624
** Bug watch added: Freedesktop Bugzilla #6689
https://bugs.freedesktop.org/show_bug.cgi?id=6689
** Bug watch removed: Freedesktop Bugzilla #6689
https://bugs.freedesktop.org/show_bug.cgi?id=6689
** Bug watch added: Freedesktop Bugzilla #6624
https://bugs.freedesktop.org/show_bug.cgi?id=6624
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libGL warning: 3D driver claims to not support visual 0x4b
https://launchpad.net/bugs/58541
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