HDMI resolution - Printable Version

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HDMI resolution - bueschi - 01-06-2019

Hello, can someone tell me, how can I get a resolution of 1280x1024@60 on a rock64? My rock64 is working fine on a full-hd TV, but i get out of range on my Belinea screen. This happens on Android, Debian and OMV.
I have check out with option "optargs=disp.screen0_output_mode=0x1b" on a new file called /boot/uEnv.txt and "extraargs=console=ttyS0,115200 disp.screen0_output_mode=EDID:0x1b rootwait rootfstype=ext4" on /boot/armbianEnv.txt without success. Also mode=720p is not working.
What is the right way to change the resolution?