Some progress : I noticed the warning "checksum failed" when I do get-edid | parse-edid on my asus monitor. As a test, I connected a Dell monitor instead and I don't get the checksum error with it. Also, after a reboot, I do get a full HD 1920x1080 resolution on the Dell monitor! So, the real issue appears to be that the kernel override does not work, the kernel still reads the EDID from the monitor even when fed the extraarg line extraargs=drm_kms_helper.edid_firmware=HDMI-A-1:edid/edid_asus_vs228.bin video=HDMI-A-1:1920x1080@60 drm.debug=0x4 from my defective edid asus monitor, or from the correct generic /lib/firmware/edid/1920x1080.bin file. How do I go about solving this? Who should I talk to? Who builds the armbian kernel? Is there a switch when building it that can be changed to solve this?

@Benedito Portela thanks for reply I have another gigabit router that works, but It doesnt have Fiber optics and tnelefone. Idk If this is useful. I contacted my provider because they don't offer access to the router. They said all ports are on automatic and it only works at 100/1000 Mbps. I've tried everything, even changing the TV Box's speed negotiation, but it doesn't support it. The only way that works is to put a device between it and the main router.

Some more info, maybe : When I run get-edid | parse-edid, I get this : ~# get-edid | parse-edid This is read-edid version 3.0.2. Prepare for some fun. Attempting to use i2c interface 1 potential busses found: 0 256-byte EDID successfully retrieved from i2c bus 0 Looks like i2c was successful. Have a good day. WARNING: Checksum failed Trying to continue... Section "Monitor" Identifier "ASUS VS228" ModelName "ASUS VS228" VendorName "ACI" # Monitor Manufactured week 43 of 2011 # EDID version 1.3 # Digital Display DisplaySize 480 270 Gamma 2.20 Option "DPMS" "true" Horizsync 24-83 VertRefresh 50-75 # Maximum pixel clock is 170MHz #Not giving standard mode: 1920x1080, 60Hz #Not giving standard mode: 1280x960, 60Hz #Not giving standard mode: 1280x1024, 60Hz #Not giving standard mode: 1440x900, 60Hz #Not giving standard mode: 1680x1050, 60Hz #Not giving standard mode: 1152x864, 75Hz #Not giving standard mode: 1280x720, 60Hz #Not giving standard mode: 1280x800, 60Hz #Extension block found. Parsing... Modeline "Mode 16" -hsync -vsync Modeline "Mode 0" +hsync +vsync Modeline "Mode 1" 25.200 640 656 752 800 480 490 492 525 -hsync -vsync Modeline "Mode 2" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync Modeline "Mode 3" 27.027 720 736 798 858 480 489 495 525 -hsync -vsync Modeline "Mode 4" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync Modeline "Mode 5" 27.000 720 732 796 864 576 581 586 625 -hsync -vsync Modeline "Mode 6" 74.250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync Modeline "Mode 7" 74.250 1280 1390 1420 1650 720 725 730 750 +hsync +vsync Modeline "Mode 8" 74.250 1920 2448 2492 2640 1080 1082 1089 1125 +hsync +vsync interlace Modeline "Mode 9" 74.250 1920 2008 2052 2200 1080 1082 1087 1125 +hsync +vsync interlace Modeline "Mode 10" 54.054 1440 1472 1596 1716 480 489 495 525 -hsync -vsync Modeline "Mode 11" 54.054 1440 1472 1596 1716 480 489 495 525 -hsync -vsync Modeline "Mode 12" 54.000 1440 1464 1592 1728 576 581 586 625 -hsync -vsync Modeline "Mode 13" 54.000 1440 1464 1592 1728 576 581 586 625 -hsync -vsync Modeline "Mode 14" 148.500 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 15" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync Modeline "Mode 17" +hsync +vsync Modeline "Mode 18" +hsync +vsync Modeline "Mode 19" -hsync -vsync Option "PreferredMode" "Mode 16" EndSection So, it looks like my monitor/cable/kernel is able to read the EDID from my actual monitor correctly. However, I am still unable to get a 1920x1080 resolution, and I find it strange that I would get this result after forcing a edid.bin file on the kernel arguments. Shouldn't I get back the EDID from the forced EDID bin file instead of my actual monitor?

thanks, pulled it.

It did not work. Here is the new boot log. My extraarg line looks like this now : extraargs=drm_kms_helper.edid_firmware=HDMI-A-1:edid/edid_asus_vs228.bin video=HDMI-A-1:1920x1080@60 drm.debug=0x4 boot.txt