Laptop: Lenovo T530
External VGA monitor: LG Flatron E2051
The LG monitor is set as primary. The login screen shows on both the laptop monitor and the external monitor. The resolution of the laptop monitor is correct, but the resolution on the LG monitor is the same as the laptop monitor, instead of the correct resolution as shown above.
If I login, the resolution on the LG monitor switches to the correct resolution.
If I lock the screen, the resolution of the LG monitor drops down to the incorrect resolution and corrects itself when I log in again.
I tried to take a screenshot of the login screen, but all I ended up with was a black image.
How do I fix this problem, so that the login screen is the correct resolution on both monitors at bootup and when the screen is locked?