Comment 0 for bug 1768610

After an upgrade from 17.10 to 18.04, I noticed that all gnome windows animations were gone. After some digging, it seems that gnome-session incorrectly assumes that my graphics has no acceleration, when in fact it does: it's a i5-2520M CPU @ 2.50GHz with Intel integrated graphics (i915 driver).

I've tried this with and without the xserver-xorg-video-intel package (a.k.a. Intel driver) with the same behavior.

The output of gnome-session-check-accelerated is: llvmpipe (LLVM 6.0, 256 bits) however the system should have DRM 2.0 capability.

GL checks (e.g. glxinfo, glxgears produce the expected output from a working DRM system).

mesa-utils and mesa-utils-extra are both installed.

I can't find a work around. Perhaps there is something wrong with my install/upgrade?

Everything else works fine, although the graphical transitions are no longer smooth. But it would be nice to restore the expected behavior.

I have attached the log of 'journalctl -b0'

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-session 3.28.1-0ubuntu2
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed May 2 13:06:00 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-04-22 (739 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-session
UpgradeStatus: Upgraded to bionic on 2018-04-27 (5 days ago)