Comment 28 for bug 1070690

I am a bit puzzled. I have tested up to 3.5.7 including the mainline 3.5.5, on which the quantal kernel is based, without encountering this error. But looking at the changelog I can't see anything related to drm or i915.
Kernel 3.6.0 had the "light" version of the bug.

[ 9.001003] [drm:drm_pci_agp_init] *ERROR* Cannot initialize the agpgart module.
[ 9.001046] DRM: Fill_in_dev failed.

However X still works despite this error, while it does not in 3.5.0-17-generic. So I'm currently testing the 3.6-rc series to find the first ocurrence.