Changing Resolution of RasPi-Builtin Monitor

I have been trying (and failing)to change the screen resolution using Configure, but can not find any way to do it which keeps the Monitor Type set as RasPi-Builtin.

I can do a temporary change using the monitor icon on the Icon Bar but that is lost with a re-boot.

What am I missing, please?

I’d just change the monitor type to Generic, and then pick the display mode you want (using Configure).

Have you updated the installation? The original published release (RC5 I think) had a few issues, not saving the screen resolution was one. I got around it by write protecting a file, but I have used packman to update since, and the other problems have gone. (I’ve not unprotected the file yet.)

Tried that, but I then get a much bigger selection of less useful resolutions.

Exactly what display is this?

The display is a 16" LED Backlit LCD TV from Currys. It has an HDMI input which is connected to the Pi HDMI out.

The native resolution of the TV is 720p – so it looks blurry at the 1080 resulution.

I have now worked out to get it to start up at 720p – by adding a Wimpmode statement in the PresDesk Configure Monitor file:
*WimpMode X1280 Y720 C16M EX1 EY1 F76

F76? Weird.

Anyway, there is a 1280×720 mode in the Generic MDF. That one runs at either 50 or 60 Hz, which I’d say is a better choice than 76 Hz. (Less likely to experience tearing.)