BTW, I'd previously added the following to /etc/X11/xorg.conf in order to try 
to get my video card to perform 'again' after the upgrade :
#Section "Device"
#       Identifier      "Configured Video Device"
#       Option          "UseFBDev"              "true"
#EndSection
Section "Device"
        Identifier "ATI Radeon"
        Driver "ati"
        Option "AccelMethod" "EXA"
        Option "MigrationHeuristic" "greedy"
        Option "AccelDFS" "true"
        Option "EnablePageFlip" "true"
        Option "EnableDepthMoves" "true"
EndSection
Don't know whether this is relevant.

-- 
glxgears randomly reports vertical sync, but isn't sync'd
https://bugs.launchpad.net/bugs/382636
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