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  1. Solved by ugly user hack: I changed file /etc/X11/xorg.conf.d/01-armbian-defaults.conf to Section "Monitor" Identifier "Monitor0" Option "DPMS" "false" Modeline "1920x1080" 148.50 1920 2448 2492 2640 1080 1084 1089 1125 # Modelline "3840x2160" 296.70 3840 4016 4104 4400 2160 2168 2178 2250 EndSection Section "ServerFlags" Option "BlankTime" "0" Option "StandbyTime" "0" Option "SuspendTime" "0" Option "OffTime" "0" EndSection Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" SubSection "Display" Viewport 0 0 Depth 24 Modes "1920x1080" # Modes "3840x2160" EndSubSection EndSection I run on 1920x1080 resolution, because on 3840x2160 crashes Xserver. U-boot works with 3840x2160 console view fine, but font is small Credits (for hack)
  2. Hi guys, I am newbie, my monitor iiyama ProLite B2888UHSU is flickering random white lines on black screen. U-boot console was displayed correctly. Same flickering I have seen on stock Armbian Bionic mainline kernel 4.19.y (next). Only Armbian Xenial desktop legacy kernel 3.10.y is working correctly. Can you help me? Maybe I can fix it, too, but I don't know, how and where to start. Thanks