Well, the developers of Nouveau (the driver you use) do not accept bug reports from people using packages made by distributions : http://nouveau.freedesktop.org/wiki/Bugs

As a consequence, you either need to report the bug to Ubuntu (Trisquel takes this package from Ubuntu and does not modify it) or try to install the latest version of the driver from Git ( http://nouveau.freedesktop.org/wiki/Source ) and report bugs to the developers.

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