Comment 20 for bug 564617

Regarding the version number of libdrmnouveau1, normally ubuntu uses a prefix for the version upstream, and a suffix for the patches it applies on it.
So, I suppose it is based on version 2.4.18 ( http://cgit.freedesktop.org/mesa/drm/tag/?id=2.4.18 )
The changelog of ubuntu patches are there : http://changelogs.ubuntu.com/changelogs/pool/main/libd/libdrm/libdrm_2.4.18-1ubuntu3/changelog
The difference between version "ubuntu2" and "ubuntu3" seems to be the correction of this bug : https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/547124 , that did not apparently affect me, and that corresponds to the following commit : http://cgit.freedesktop.org/mesa/drm/commit/?id=df32c307e8f81b46ee8aa4dd7222fc18f175bbb3
Not sure if it's really relevant in our case.

Maybe version alpha3 of ubuntu had the option "nouveau.noaccel=1" by default, and not in version beta2? Which would explain the difference of behavior even if the versions are very close.