you can tweak your timing a little bit.Now the problem is the overscan. The text goes out of the screen and I did not found any working option to scale the display.

Example below add 16 pixels of 'margin' to the timing. This is simply achieved by reducing the active are size by 32pixels and increasing horizontal front an back porch by 16 pixels each.
I've not altered the vertical display! Waiting for your confirmation that you're able to achieve a full-screen picture with these settings (which I have my doubts...)
Code:
dtoverlay=vc4-kms-dpi-genericdtparam=clock-frequency=13500000dtparam=hactive=688,hfp=28,hsync=64,hbp=84dtparam=vactive=288,vfp=3,vsync=3,vbp=18dtparam=hsync-invert,vsync-invert
Statistics: Posted by aBUGSworstnightmare — Mon Feb 05, 2024 9:26 am