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Raspberry Pi 3B at 4K UHD in Portrait Mode



  • Hi guys!
    I bought a 4K UHD screen as a display for my Magic Mirror project. I was able to make my Raspi 3B output a HDMI signal at 3840 x 2160 (15Hz), but it only works in Landscape Mode. When I switch to portrait mode (by adding display_rotate=1 to /boot/config.txt) the Raspberry Pi would not boot up anymore (display rotation however worked at 1920x1080).

    I have seen other people struggle as well, but some have succeeded by making changes to the X Framebuffer. Unfortunately, that has not worked for me.

    So: can anyone share a working configuration for 4K Portrait Mode with a Raspi 3B on Raspbian 9 Stretch?

    Thanks for your help!
    Kevin

    P.S. So far, my /boot/config.txt contains the following video-related commands that I had put together from various sources:

    disable_overscan=1
    
    framebuffer_width=3840
    framebuffer_height=2160
    max_framebuffer_width=3840
    max_framebuffer_height=2160
    
    hdmi_group=2
    hdmi_mode=87
    
    hdmi_ignore_edid=0xa5000080
    hdmi_cvt=3840 2160 15
    
    gpu_mem=256
    


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