Take the 2-minute tour ×
Ask Ubuntu is a question and answer site for Ubuntu users and developers. It's 100% free, no registration required.

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,

Yoder

share|improve this question
add comment

Know someone who can answer? Share a link to this question via email, Google+, Twitter, or Facebook.

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.