Following directions from http://linux-hybrid-graphics.blogspot.com/ (which 
could use some ;'s added to the commands given)
This is a Dell Alienware M17x.

$ sudo dmidecode -s system-product-name
M17x          
$ sudo dmidecode -s system-version
A0323
$ lspci -vnnn | perl -lne 'print if /^\d+\:.+(\[\S+\:\S+\])/' | grep VGA
02:00.0 VGA compatible controller [0300]: nVidia Corporation GT200 [GeForce GTX 
260M] [10de:0618] (rev a2)
03:00.0 VGA compatible controller [0300]: nVidia Corporation GT200 [GeForce GTX 
260M] [10de:0618] (rev a2)

Please note that I am unable to get any kind of video with hybrid mode
enabled in the BIOS; just a black screen almost immediately after grub.
When I disable hybrid mode in the BIOS I can not even _see_ the 9400 in
Linux Mint Helena with this laptop even though it is there. So while the
lspci command doesn't show the 9400, it _is_ there...

** Attachment added: "DSDT.dsl"
   http://launchpadlibrarian.net/40917395/DSDT.dsl

-- 
support graphics card hot switch
https://bugs.launchpad.net/bugs/312756
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