Comment 127 for bug 862430

For anyone who has accidentally upgraded compiz and the flickering has reappeared, this is what I did to fix it:

# list all packages that need to be downgraded
dpkg -l | grep '0.9.7.8-0ubuntu1.2'

# see what versions are available
apt-cache show compiz | grep Version: | awk '{ print $2 }'

# downgrade
sudo aptitude install compiz=1:0.9.7.8-0ubuntu1vvpreproposed2 compiz-core=1:0.9.7.8-0ubuntu1vvpreproposed2 compiz-gnome=1:0.9.7.8-0ubuntu1vvpreproposed2 compiz-plugins=1:0.9.7.8-0ubuntu1vvpreproposed2 compiz-plugins=1:0.9.7.8-0ubuntu1vvpreproposed2 compiz-plugins-default=1:0.9.7.8-0ubuntu1vvpreproposed2 libdecoration0=1:0.9.7.8-0ubuntu1vvpreproposed2

# restart compiz
compiz --replace

Then just remember not to upgrade it again. Of course, you could also just pin the package at the PPA version, but then you'd have to remember to unpin it in the future.