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+--- Thread: External display question (/showthread.php?tid=4857)
External display question - Bedwyr - 05-04-2019
Is there a way to switch display and resolution once you have an HDMI display plugged into the system? I see here: https://www.raspberrypi.org/forums/viewtopic.php?t=147962 that you can set this for boot time, but there isn't a way to disable the internal display and adjust to HDMI output from the command line once booted?
RE: External display question - Flavor - 05-04-2019
I think, if I get what you're asking, you want to use the 'tvservice' command.
https://www.raspberrypi.org/documentation/configuration/hdmi-config.md
This could give a bit of background, too.
https://www.freeplaytech.com/support/freeplay-zero-cm3-hdmi/
Disabling the LCD might require a bit more info. You can disable the framebuffer copy process and then turn off the backlight. What LCD driver are you using?
RE: External display question - Bedwyr - 05-05-2019
I don't have to turn off the LCD, it's just that the LCD resolution propagates to HDMI external so that the display is blurry and blocked off screen.
RE: External display question - Flavor - 05-07-2019
Actually, the HDMI gets copied (and downscaled) to the LCD. You should be able to use that tvservice command (or the /boot/config.txt settings) to get a better HDMI resolution if you don't care about how the LCD looks.