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AFAIK removing bumblebee will stop you from using the nVidia GPU at all, everything will be done by the intel video chip. If you do that you might as well turn off the nVidia GPU, its just sitting there eating power for no reason....
No bumblebee here and ,,,
name of display: :0.0
display: :0 screen: 0
direct rendering: Yes
server glx vendor string: NVIDIA Corporation
server glx version string: 1.4
server glx extensions:
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 540M/PCIe/SSE2
OpenGL version string: 4.2.0 NVIDIA 295.40
OpenGL shading language version string: 4.20 NVIDIA via Cg compiler
Hmmm....could be various reasons why you've got no intel 'sandy bridge' video listed at all.
Did your laptop come with win7 starter? Starter doesnt support optimus, and optimus capable laptops using starter use a setup more like switchable graphics. In at least some cases, if you use windows starter to switch to the nVidia GPU then install linux it stays switched to the nVidia GPU, and you can install the nVidia drivers, etc. without bumblebee.
No, it came with Win7 pro, but I haven't used it much.
Every time I have booted it, it spends about half an hour installing updates and telling me not to turn off, then rebooting to another half an hour of updates.
By the time it is usable I've forgotten what I was booting Windows for ... :/
Anyway, I'm not fussed. The sid nvidia-dkms worked without a hitch, and the squeeze-backports the same. 3D performance is good & power usage is as expected (about 2.5 - 3 hours normal use) so I haven't bothered exploring.
I had expected some struggles with the stated 'hybrid graphics', but the only sign of the intel was the informational boot message.