When i select normal settings in
system > preference > appearance > visual effects from none, my system GUI
turn upside down, It's not a 180 degree rotation but a mirror reflection ,observe the two screens , i don't know what
to do except reporting this bug
but apport seems to not submit any kind of report so I filed the report to launchpad,
I have no problem with this bug because changing settings to none recovers from it but ,
what if someone want to use compiz, this is reported as bug
#267269 in launchpad.