Graphics card driver issue: If the graphics card driver is not installed correctly or is outdated, it may cause the resolution to not be adjustable.
Screen settings issue: it could be that the screen settings do not support the required resolution, or there is a problem with the connection line.
There may be a problem with the configuration of the X server, preventing the resolution from being changed properly.
Permission issue: The current user may not have sufficient privileges to modify the resolution.
Other unknown issues: It is also possible that other unknown problems are causing the inability to change the resolution, further investigation is needed.
