Comment 4 for bug 1606122

The bug doesn't reproduce anymore. Both the extracted-from-xfwm4.c test program and xfwm4 now work, on my Ubuntu 16.04 machine with the NVIDIA GeForce 750 Ti card. I configured it back to nouveau and enabled compositing.

I'm guessing an update fixed it?

$ lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04

$ uname -a
Linux atom 4.4.0-77-generic #98-Ubuntu SMP Wed Apr 26 08:34:02 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

$ apt-cache policy xorg
xorg:
  Installed: 1:7.7+13ubuntu3
  Candidate: 1:7.7+13ubuntu3
  Version table:
 *** 1:7.7+13ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy xserver-xorg-video-nouveau
xserver-xorg-video-nouveau:
  Installed: 1:1.0.12-1build2
  Candidate: 1:1.0.12-1build2
  Version table:
 *** 1:1.0.12-1build2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

(I suppose I should have included libcairo2 originally?)

$ apt-cache policy libcairo2
libcairo2:
  Installed: 1.14.6-1
  Candidate: 1.14.6-1
  Version table:
 *** 1.14.6-1 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

(The xfmw4 version number is bogus -- I'm using my own patched version to work around an incompatibility with VirtualBox.)

$ apt-cache policy xfwm4
xfwm4:
  Installed: 4.12.3-9ubuntu2
  Candidate: 4.12.3-9ubuntu2
  Version table:
 *** 4.12.3-9ubuntu2 100
        100 /var/lib/dpkg/status
     4.12.3-1ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages