На одной старой машине пришлось установить nvidia-glx-legacy. Есть ли у 
кого-нибудь опыт, насколько страшно влючить следующие опции (цитирую README к 
пакету):
Option "AllowGLXWithComposite" "boolean"
                Enables GLX even when the Composite X extension is loaded.
                ENABLE AT YOUR OWN RISK.  OpenGL applications will not
                display correctly in many circumstances with this setting
                enabled.  Default: GLX is disabled when Composite is
                loaded.
Option "RenderAccel" "boolean"
                Enable or disable hardware acceleration of the RENDER
                extension.  THIS OPTION IS EXPERIMENTAL.  ENABLE IT AT YOUR
                OWN RISK.  There is no correctness test suite for the
                RENDER extension so NVIDIA can not verify that RENDER
                acceleration works correctly.   Default: hardware 
                acceleration of the RENDER extension is disabled.
-- 
Алек
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