About 20% of the time when I boot up I seem to not have 3d acceleration or some other slowdown is occurring. I get only 2.9 fps from glxgears, for example.
There is an error in the X log when this happens:
(EE) Dec 21 10:47:46 NVIDIA(0): WAIT: (E, 0, 0x857d, 0)
Restarting X solves the problem, but is annoying.
This is on CentOS 5.2 with a custom built linux 2.6.36 vanilla kernel, 260.19.29 driver, and a GT 240 card.
Debug file attached.
Let me know if you need anything else to help debug this.