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Hardware

I have a 15.6-inch laptop with a UHD display (with resolution 3840 x 2160), which is a HiDPI.

282.42 PPI = Actually, an eXtra High density display according to this calculator.


System

Linux Mint 19 Cinnamon 64-bit. UEFI installation.


Situation

I dual-boot with Windows 10 on a separate drive and choose via Grub2 what I need at that moment.

The Grub2 is by default on my hardware set to be displayed in full resolution of 3840 x 2160.

This is incredibly hard to read, practically impossible to do any other thing than press Enter.


Intention

I would like to set some lower resolution like 1920 x 1080 or lower depending on what would be readable.


Approach

I looked at the comments of /etc/default/grub file, stating, excerpt:

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
#GRUB_GFXMODE=640x480

I simply uncommented the GRUB_GFXMODE line and set it to 1920x1080.

Which after sudo update-grub I tested with the result being unchanged resolution.

So, I put hopes in the vbeinfo command, which was not recognized by my Grub2.


Question

What am I doing wrong here?

And how do I discover all of the supported resolutions?

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I discovered that on my system the following command works for listing supported resolutions:

videoinfo

Call it from inside Grub2 prompt, and take a photo of it (that was my approach) or remember it.


In my case, for some reason, the 1920 x 1080 resolution was not in the list.

I tried various supported resolutions, and in the end, settled for 800 x 600.

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