Normally a 1080p HDTV connected with HDMI should show up like this:
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efflandt@raspberrypi ~ $ tvservice -s
state 0x12001a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60Hz, progressive
The only audio/video related settings I have in /boot/config.txt are disable_overscan=1
, and after some rpi-update I had to uncomment hdmi_force_hotplug=1
. That should fill the screen be sharp if your TV has some mode to do that, which my LG calls "Just Scan" or Samsung calls "Screen Fit".
My first Pi initially ran at a lower resolution with the Oct Raspbian image. But maybe that HDMI input was set to a different mode, because once I got it full screen, it has remained that way, whether I redid a fresh Oct Raspbian image or newer image or updates since then.
If the image on your HDTV is too small or too big, you may need to set disable_overscan=0 and play around with overscan settings. But first see if your TV has a setting to make it fit.