• XRandr
• Linux HighDPI

• nvidia 드라이버에서 발생하는 것으로 보임.
• (SOLVED) resume from suspend not working with 980 Ti, drivers 352 - 370, kernels 3.16 - 4.4 - GPU Unix Graphics / Linux - NVIDIA Developer Forums
• resume from suspend freezes system (GTX 970, Arch Linux, Kernel 4.4/4.7, NVIDIA 370) - GPU Unix Graphics / Linux - NVIDIA Developer Forums
• One Monitor Doesn't Wake from Sleep Mode / Applications & Desktop Environments / Arch Linux Forums

~/.xprofile 혹은 ~/.xinitrc 에 다음 시도
 
xset s off

• How To Control Your Monitor Brightness From Command Line In Ubuntu?
• 0~1.0 사이로 지정한다.

# 약간 어둡게
xrandr --output eDP-1-1 --brightness 0.5
 
# 밝게
xrandr --output eDP-1-1 --brightness 1.0
 
# 모니터 번호를 모르면 아래와 같이 검색
xrandr | grep " connected" | cut -f1 -d " "