Hi, Upstream added a new --disable-acceleration-check option [1] recently, which is exactly what you want. However, it is too late to include it for Jessie, so it will be in 3.16 packages for Stretch.
[1]: https://git.gnome.org/browse/gnome-session/commit/?id=d44fe3181c82f473 -- Dmitry Shachnev
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