In BIOS, there are three options. Integrated, Discrete and Optimus. It says that OS will switch to Optimus if supported. I think there is also an option to prevent that from happening.
After doing some troubleshooting on another issue, I have system back working. But not sure if my messing around got me back where I should be!
What I see, is that my laptop screen is on Intel HD 3000 and my external monitor on Nvidia Optimus. Is that normal?
I ask because my Windows Experience graphics score is now lower than it was before (5.9 vs 6.5)
I see no easy way to switch from External to laptop monitor. Seems there are two competing controls - The windows Display controls in Control panel and the Nvidia control panel. I am sure this wasn't always like this?????
Another strange thing - The NVIDIA control panel brings up only the laptop as option - the one that is apparently being controlled by the Intel graphics. Can't switch there. The Windows Display in Control panel brings up the External monitor (controlled by NVIdia. But there I can switch displays. Finally discovered that I can switch displays by using Fn F7 on laptop keyboard but not using my USB external keyboard!
If it seems like I am confused - I am! And I have owned this T520 for 5 years (IBM Re-Certified used unit)
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In any version of Windows starting from Windows 7 there is a built-in key combination to switch between different multi-monitor options: WinKey+P. Fn+F7 on these systems does essentially the same thing as Win+P.
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I thought the video stuttering I mentioned in another thread had been solved with new cable, but it is back again. Simple test I do, is run any CNN video on laptop. Works perfectly. Run same video after switching to external monitor and every few seconds, I briefly get that circling arrow and the video stutters. Less than before I changed cable, but still happens. I will go back to the other thread to keep things in same place.
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