When I connect my raspberry pi to a monitor through an HDMI cable, the resolution gets lower at the boot of the desktop UI, but when I click on start menu it turns to 1920×1080. Sometimes it randomly changes. I set the resolution at 1920×1080. What is the matter?
You can force the raspberry pi to use a specific resolution for HDMI, you do this by plugging you sd card into a computer and modifying the
specifically you want to uncomment the following lines:
framebuffer_width=1920 #set the resolution of the TV framebuffer_height=1080 #set the resolution of the TV
and change the two values to the appropriate resolution for your TV