This is something old I noticed. Chipset: Intel 945GME Driver: latest git sna-enabled but going back quite a few versions as well Problem: glxgears runs at ~35fps if you run intel_gpu_top, it runs at almost perfect 60 in sync with the display I've noticed this behavior for a long time with quite a few driver versions. Btw, I dig the new SNA! I think I might just daemonize the gpu_top to make compositing window managers work correctly.
*** This bug has been marked as a duplicate of bug 30364 ***
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