HP with dual core using last English images. Screen resolution

Hi,

I'm preparing several HP computers for a trip to the Gambia. Right now, I've erased and installed Linux Mint (24_04_LTS_EN_BASIC) on two of them. I have experienced the same problem on both of them.

When I boot from the Labtix 3 USB, the computer starts with resolution 1024x768. It's the highest resolution I can get with Arandr. After the installation of the O.S. it is, also, the highest resolution (see images 8161.jpg and 8162.jpg).
These computers were working on Win 7 Pro and the installed driver had a lot of possible resolutions, among them 1440x900 which is the one of the monitors.
The driver that is installed on Linux is => " Kernel driver in use: i915" which, according to the information from Intel that I've found, is the right one.

I've searched, and I have found a solution by modifying the file .profile, both for the user labdoo and student. See image 8163.jpg

These are the lines I've added to the files (labdoo and student) .profile:

xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync

# Add the new mode to the display output
xrandr --addmode VGA-1 "1440x900_60.00"

# Set the new mode of the display output
xrandr --output VGA-1 --mode "1440x900_60.00"

There are two problems left though: the login screen is quite ugly (see image 8162.jpg) with Labdoo background cropped and secondly that I can't modify the .profile file for the user guest as it is erased at logout.

I'd like to find a solution that loads the video mode before the login screen and holds for any user.

I have tried several solutions found in Internet but none of them has worked. I don't want to mess up with the system files either as I won't be able to follow the computers in the future.

Have you found the same issue with Intel graphic cards, or know the way to solve it?

Any help would be greatly appreciated.