[ubuntu] resolution out of range at grub and desktop enviroment

[ubuntu] resolution out of range at grub and desktop enviroment


Hi, I have a trouble with a computer where I installed Ubuntu 20.04, which doesn’t recognize my display properly. I managed to set a proper resolution adding following xrandr commands to my .profile file: Code: xrandr –newmode “1600x900_60.00”  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync xrandr –addmode HDMI-3 1600x900_60.00 xrandr –output HDMI-3 –mode 1600x900_60.00 Now I’d like at least to set proper resolution to gnome, in order to correctly display the login screen (at the moment I have just one user with automatic access just to set things right, but I’m planning to add two more user each with its password). I edited /etc/gdm3/Init/default but nothing changed, I have a message on my monitor saying “out of range” resolution. I also copied my ~/.config/monitors.xlm to /var/lib/gdm3/.config folder but again, with no result Plus, I’d like to be able to see the grub menu, even in a lower than native resolution, but editing the config file and setting the GRUB_GFXMODE and GRUB_GFXPAYLOAD variables gave no results. It seems that the computer believes that the correct output should be 1920×1080, but it’s obviously wrong because maximum resolution is 1600×900. I’m suspecting that it could have something to do with the framebuffer and some kernel module but I’m not that skilled to mess with those things. How can I troubleshoot this problem? Any help is much appreciated.


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