[ubuntu] Failed to load module "nouveau" (already loaded, -1217058309)

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http://ubuntuforums.org – My Ubuntu 12.04-32bits often (but not always) fails to load the proper nouveau driver and then falls back to the vesa driver, giving a low resolution and no external screen. As said, if I am lucky it loads ok (1 out of 10 tries). I have the 11.09-64bits version in dual-boot on the same laptop and this has no problem. Any hints? Details are: Code: Device: VGA compatible controller: NVIDIA Corporation G86 [GeForce 8400M GT] (rev a1) Kernel: 3.2.0-29-generic-pae X-server: X.Org X Server 1.11.3 Release Date: 2011-12-16 [    77.710] X Protocol Version 11, Revision (Hardware)