I had the same problem, Jetson nano 2 GB, fresh install connected to a TV and the letters where too small to read (the same size as the pixels).
I could figure it out, with the solution discussed, but as I was new on linux too, the information given here is not enough to solve it easily. So, I will try to explain in detail what I had to do.
We can use the image of the desktop given on “suhpavn” comment as a reference.
First let’s check our DPI settings.
- Open the icon with a screen to access a command tool.
- Type “xdpyinfo | grep dots" to check, I had 25x25, we want to change it to 96.
- Open the icon with a folder
-Type on the address bar “/usr/share/lightdm/lightdm.conf.d/” and enter to access the folder
- There are like 6 files, the last one is the one we want to open, open it and check if the name is “50-xserver-command.conf”
- At this point I had a problem, because the file is read only, you can see this after the file name, or when you try to save it. If this is the case follow step 3 too.
- To change DPI we have to add “-dpi 96” to the “xserver-command=X -core” line like this “xserver-command=X -core -dpi 96” .
- Save and restart the Jetson. (Open the bottom left bar, click on the last element, and search for the restart icon). Should be solved after the reboot.
If the file “50-xserver-command.conf” is read only (Step don’t needed otherwise).
- We have to change the permissions of the file with root permissions.
- Open the command tool again.
- Type “cd /usr/share/lightdm/lightdm.conf.d/” to go to the file folder
- Type “sudo chmod u=rw,g=rw,o=rw 50-xserver-command.conf” ( sudo executes the chmod(or any) command with root access).
- The command tool will ask for the user password, type it.
- Permissions should be changed. now you should be able to finish the step 2.
( You can check permissions of the file with the command “ls -l 50-xserver-command.conf” ( at command tool, when you are on the correct folder) u is for User, g is for Group, o is for Other. w -> write, r -> read, wr-> write and read)
( - If you want, you can revert the permission changes, follow this step but use “sudo chmod u=rw,g=r,o=r 50-xserver-command.conf” )
I hope it will help. I will try to improve the details if needed
I changed my account type to admin, I don’t know if it’s needed too.