and thanks for reading my question. (Before posting I checked many other questions on this forum, as well on other websites.) Recently I booted a live elementary OS Loki image on an old laptop to try the OS out and I decided to install it. Before installing, my display wasn't detected but the resolution was automatically set 1280*720, which is the ideal resolution for my screen. However, since I installed the OS the default resolution became 640*480 (4:3) and the display remains undetected. I cannot change it using the provided GUI (System Settings>Display), and I also tried to change it by using xrandr on the terminal but I found this quest to be fruitless.
I thought it could be a problem with my old laptop's graphics driver (Silicon Integrated Systems), since it appears it's support for linux has long been discontinued, and I also tried various methods for fixing this.
However, it still puzzles me how everything (resolution-wise) worked perfectly before the install. I even copied the kernel drives once from the live ISO image to my HDD in hopes the required drivers/the method through which the resolution was working would pass on to my installation...but that didn't work either (had to reinstall everything afterwards).
I was hoping there was a way to reproduce the same effects I have when I boot from the live USB to when I boot from the HDD, if more advanced things such as getting the OS to recognize my screen don't work.
If you know of a possible solution, please let me know. Thanks!