I think there is a interesting change in current kernel tree.
They are going to effect the upcoming linux kernel 3.3 .
It concerns for example the driver nouveau
(the Free and Open driver for nVidia graphic devices),
and probably the nVidia Optimus hybid graphic technique
and vga_switcheroo .
I do not really know where are those changes leading to and what exactly will be changed but have a look for yourselves and form your own opinion about the changes and their possible effects.
For example have a look at:
git.kernel.org - linux/kernel/git/torvalds/linux-2.6.git/commitdiff
nouveau: Support Optimus models for vga_switcheroo
author Peter Lekensteyn <firstname.lastname@example.org>
Sat, 17 Dec 2011 11:54:04 +0000 (12:54 +0100)
committer Dave Airlie <email@example.com>
Fri, 13 Jan 2012 09:09:15 +0000 (09:09 +0000)
Newer nVidia cards with Optimus do not support/use the DSM switching functions.
Instead, it require a DSM function to be called prior to bringing a device into
D3 state. No other _DSM calls are necessary before/after enabling/disabling a
device. Switching between discrete and integrated GPU is not supported by
this Optimus _DSM call, therefore return on the switching method.
Kernel Log: Coming in 3.3 (Part 4) – Drivers
Staging, DMA buffers, Miscellaneous (=Page 2) [The H Open Source,]
Direct Rendering Manager (DRM) on the DRI Wiki