Check the layout before the hardware verdict
Microsoft documents a case where connecting an HDR television to a laptop in duplicate mode prevents HDR availability. Its suggested change is to extend the desktop across the displays. This is a specific layout check, not proof that every missing HDR control has the same cause.
Open Display settings and identify the selected TV. Record duplicate mode and the visible HDR state before changing anything. That gives the comparison a clear starting point.
Extend, then inspect the same screen
Choose the extended arrangement and revisit the TV’s HDR options. Keep the cable, adapter and television input fixed. If HDR becomes available, test a normal desktop and a known supported video before adopting the layout.
If the option remains absent, review the entire hardware and connection requirements. A layout change cannot add HDR capability to an unsupported display or connection route.
Keep the practical consequence visible
An extended desktop behaves differently from duplication. Move the viewing app to the TV deliberately and check the pointer’s route back to the laptop. A successful HDR setting is only useful if the household can operate the resulting layout.
When asking for help, report both the HDR outcome and the display mode used. This distinguishes a documented duplicate-layout limit from a general claim that the television or computer lacks HDR.
Questions answered
Does this prove the TV is not HDR-capable?
No. The documented problem can concern the duplicated layout.
Will Extend guarantee HDR?
No. All remaining hardware, connection and software requirements still apply.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.