I have a Dell Inspiron 7777 and have an external display (TV) connected via HDMI. When it is configured for Extended display it works perfect. When I have it connected as a Duplicate display the performance of the graphics drops significantly. As examples, pressing the Start button in Windows causes a delay in the menu appearing, and dragging a window around the screen is choppy. Disabling or disconnecting the HDMI cable immediately resolves the issue. I have installed the latest Intel Driver via the Dell website 126.96.36.19987. I tried installing the latest driver form the Intel website but I could not because it said it was not designed for my device.
Any help would be appreciated.
Thanks for getting back to me! Here are the answers you requested, and the scan results are attached.
2 different TVs. Brand Samsung. Models: UN65NU7100 and UN58NU7100
I've had it connected both via a direct cable connection and also through a 4 port HDMI Powered Switcher. Both ways of connecting cause the same result.
Something about the direction of this conversation isn't sounding right to me. The lag isn't on input from the keyboard/mouse or from the TV. The lag is in the display of the graphics on the screen. For example, when I do not have the HDMI cable plugged into the back of the computer the whole screen is very "zippy". The start menu appears very quickly and smoothly. Dragging open windows around is smooth and not choppy. The experience is as expected. The moment I plug anything into the HDMI port and set the display to Duplicate (not Extend) the screen elements/animation get choppy. I unplug the HDMI cable and it is back to normal.
For more info, I have the HDMI cable coming out of the back of the computer and plugged into a 4 port HDMI powered switcher. Even if the TV is off the graphics get choppy on the built in display when the cable is plugged into my switcher.
Based on this information do you still want me to adjust things? I did check the refresh rates and the monitor is set to 59 and the TV is something in the high 20's.
Brilliant! Changing the refresh rate for the TV to 59hz solved the issue. Why would the refresh rate of the TV impact the refresh rate on the primary monitor? It almost seems like the setting for the refresh of the monitor was being overridden by the rate on the TV without the user knowing it. Can you tell me what the optimal refresh rate would be for both? Is it 59, 60, 60i or 60p? I currently have them both at 60p. 60i tends to have the image on the TV too low and cutoff by about an inch.
Thanks so much!
A related issue has come up that I hope you might be able to help with. Each time the HDMI cable is attached, or the input on the HDMI switch is selected, the refresh rate for the TV jumps back down to 29Hz. which then makes the computer display choppy again (even though the refresh rate in the driver utility shows the display is still at 59Hz). Do you know what can be done to prevent this?
So, for now the issue as I described it isn't there anymore. I have been working late nights so my memory might have gotten the best of me. I will ping you back if I can reproduce the issue, but as of now the issue is not present.