1. Yes, reducing resolution of the external monitor (1440 x 900, to be exact) fixed the issue.
2. I typed that in the terminal and issue persisted.
3. Unfortunately, my laptop doesn't support USB-C DisplayPort (i've tried with my friend's 2K monitor with DisplayPort to USB-C cable and the monitor wasn't receiving any signal), and changing refresh rate to bearable numbers (like 50Hz) didn't help.
1. Yes, reducing resolution of the external monitor (1440 x 900, to be exact) fixed the issue.
2. I typed that in the terminal and issue persisted.
3. Unfortunately, my laptop doesn't support USB-C DisplayPort (i've tried with my friend's 2K monitor with DisplayPort to USB-C cable and the monitor wasn't receiving any signal), and changing refresh rate to bearable numbers (like 50Hz) didn't help.