Windows 10: Screen Resolution issue when duplicating across monitor and TV

Hi all, hope someone can provide some clues as to what I need to do to get screen resolution from changing when I switch display settings from extended to duplicate screens.

PC is a self built machine with on Intel HD board graphics, however I am using a Radeon 6870 GFX card. the latest drivers have been installed (15.20.1062.1004-150803a-184226E)

I have a Dell P2414H monitor that is connected to the GFX card using DisplayPort cable and a 46" Sony HX823 LED TV connected via HDMI from the GFX card as well.

the monitor and TV both support 1920x1080 resolution and this is the resolution that the Dell runs on when the display setting is set to Extended Displays.

When I want to watch a movie I set the display to Duplicate Displays, the resolution drops to a lower setting as the taskbar and open windows all increase in size. the display properties however still report the resolution as 1920x1080.

Any ideas why this is happening? and what I can do to stop it from occurring?

Many thanks

:)

 

TV Monitor Black when switching from laptop

Hello,

I have an issue regarding my laptop and a tv I was trying to use as monitor. At first, I managed to connect the two via HDMI cable without an issue (the only problem was the resolution quality on the tv) but then I accidentally changed the tv resolution
from my laptop to 1024x768, From that moment, the tv went black and now it only works when I duplicate or extend the screen. When I try to use the tv as the only monitor, whatever I do, it goes black. Unfortunately I can't change resolution from tv, and changing
ratio doesn't help. Likewise, I can change tv resolution from laptop when duplicating or extending, but obviously this goes black as well when I try to switch to monitor 2. Is there a way to solve this issue?

Thanks.

 

TV Monitor Black when switching from laptop

I have the same issue, but I have no restore point. When switching from extend monitor settings to show on monitor 2 only, my screen on my tv goes black. I have tried every resolution and every frequency and nothing works to show the TV as the only screen.
It works fine when I duplicate the monitors, or extend the monitors, but not when I use the TV as the only monitor. Any help?