HDMI to LCD monitor: not scaling up in non-native resolution, so wide black borders on edges. Is this normal?

[jmcyang]

I have a Windows tablet connected thru HDMI to a 1920x1080 LCD monitor, and would like to run the tablet at 1280x720 at times. However, when I try to do so, the monitor just stays at its native res of 1920x1080 and shows the 1280x720 desktop in a little box in the center of the screen with black borders around the edges, instead of interpolating the 1280x720 up to 1920x1080.

Is this normal (and unavoidable) for an HDMI connection, or is there something I can do?

(It's an Intel Bay Trail CPU w/Intel HD Graphics iGPU, so unrelated to a similar problem in ATI's Cadalyst Control Center which I came across in Google.)

Many thanks.

 

[jmcyang]

Never mind... I found it's a setting in the Intel HD Graphics Properties control panel - under "Scaling", you need to choose the "Maintain Display Scaling" option, then it will interpolate.