12-16-2011 04:18 AM
I have a T410s running Windows 7 64-bit. I'm experiencing the following problem when using the projector:
I connect the projector, everything works well for a few minutes and then the image begins to flash on and off continuously: it switches off (blue screen) then back on, off again, on again... and so on. There seems to be no remedy: i have to restart the computer and try again but the problem invariably comes back.
Has anyone experienced this? Any suggestions would be greatly appreciated. I have a feeling that it's caused by the graphics driver (NVIDIA NVS 3100M) but I'm really not sure.
Thanks a million for any advice,
Solved! Go to Solution.
12-19-2011 12:32 AM
I'm actually not sure how to check whether it's Optimus-based... (sorry, i'm really an amateur...). I searched my C drive and found a folder called Display.Optimus containing a file called Optimus.nvi. Does this help?
I do have two GPUs: Intel and NVIDIA. Do you think that when the projector image goes all crazy, it's the two of them auto switching back and forth?
Thanks so much...
12-19-2011 12:46 AM
That's the problem. You are using a dual GPU machine known as Optimus. If you press the power button and hit the F1 key when the lenovo logo and information displays, you can get into the BIOS setup and Configuration.
Change the Display setting to Discrete and you'll be able to use external projectors properly.
Use Optimus when you need to conserve energy on battery.
12-19-2011 05:31 AM
OK great, thanks for the advice!
I changed the "Graphics Device" to "Discrete graphics".
I also changed "OS Detection for switchable graphics" to "Disabled".
I'll see if this works during my next lecture.
One more question: when you say "Use Optimus when you need to conserve battery" - how can I change back to Optimus? Woudl i need to go back to BIOS and rechange it?
12-19-2011 09:03 AM
Correct, You would need to go back into the BIOS and flip the settings. It's a bit of a hassle but the only sure fire way I know to guarantee control for the projector.
When you are on the BIOS Discrete mode and Windows 7 is running, you can use the Windows key + P to flip between the various monitor display settings (Computer only, Duplicate, Extend, and Projector Only). Most presenters want Duplicate unless they are using advanced PowerPoint techniques with notes.