Actually, the bug is crashing compiz rather than X.
It sounds like when doing alt-tab, to draw the dialog compiz is passing
in a GL format that mesa doesn't support.
_mesa_format_to_type_and_comps in ./src/mesa/main/formats.c is basically
just a big huge switch statement for every possible texel format, which
is used to generate mipmaps. In this case, it is getting to the end of
the switch statement, where it hits the default, which is to issue the
format error:
_mesa_problem(NULL, "bad format in
_mesa_format_to_type_and_comps");
So, we need to know what format compiz is passing in.
** Also affects: compiz (Ubuntu)
Importance: Undecided
Status: New
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Compiz crashes when hitting Alt-Tab - Mesa 7.9 implementation error: bad format
in _mesa_format_to_type_and_comps
https://bugs.launchpad.net/bugs/682327
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