https://bugs.freedesktop.org/show_bug.cgi?id=110822
--- Comment #6 from Sylvain BERTRAND sylvain.bertrand@gmail.com --- bisect is quite common in the git world. You'll find tons of tutorials on the web, namely you're good for a little bit of reading. Just don't forget to "git reset --hard" before calling "git bisect good|bad". (just performed a bisection on linux yesterday).