How to change screen resolution of Raspberry Pi

If you are like me using a TFT that is connected via SPI (e. g. PiTFT 2.8" 320x240) driven by FBTFT in combination with fbcp to utilise hardware accelerated video decoding (using omxplayer) like it is descriped here. You should add the following into the /boot/config.txt to force the output to HDMI and set the resolution to 320x240:

hdmi_force_hotplug=1
hdmi_cvt=320 240 60 1 0 0 0
hdmi_group=2
hdmi_mode=87

Just run the following simple command on Raspberry Pi 3 running Raspbian Jessie.

run terminal and type

sudo raspi-config

Go to: >Advanced Option > Resolution > just set your resolution compatible fit with your screen.

then

reboot

If you didn't found the menu on configuration, please update your raspberry pi software configuration tool (raspi-config).

That's all TQ.

I made the following changes in the /boot/config.txt file, to support my 7" TFT LCD.

Uncomment "disable_overscan=1"

overscan_left=24
overscan_right=24
Overscan_top=10
Overscan_bottom=24

Framebuffer_width=480
Framebuffer_height=320

Sdtv_mode=2
Sdtv_aspect=2

I used this video as a guide.