I have a ThinkPad T430s. The device includes an nVidia NVS 5200M GPU (with Optimus, i.e., hybrid graphics).
Now since kernel 3.5 the vga_switcheroo way to switch between integrated and discrete graphics should be available per default.
However, I do not have the /sys/kernel/debug/vga_switcheroo file on my system, even though I use the standard kernel and I am not using nomodeset. The respective BIOS setting is also set to Optimus and I also am able to find the nVidia device with lspci; the nouveau module is loaded as well.
What could be the reason for the absence of the switch? I am very thankful for any input. Kind regards,