vanessa@rainbird:~/Minetest-related/minetest_client$ git bisect good
cd1f604ffe6130fd7d3a8358a8cebd7f821f9a11 is the first bad commit
commit cd1f604ffe6130fd7d3a8358a8cebd7f821f9a11
Author: Perttu Ahola <celeron55@gmail.com>
Date:   Sun Dec 2 14:24:58 2012 +0200

    Handle day-night transition in shader and make light sources brighter when shaders are used

:040000 040000 132e1ba6e9b9113050c583892566dffb8957530c 401743710c35605a3dca31fa8e2ad75f8a70284c M	client
:040000 040000 697d41c824350f4a20e0be648522d9dbfb0d4c48 19122eab71aa094aa365ad07489020c50ac92cfe M	src
vanessa@rainbird:~/Minetest-related/minetest_client$