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
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https://bugs.launchpad.net/bugs/1606122
Title:
Cairo drawing coordinates are broken w/nouveau (affects xfwm4)
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