I installed my laptop with backbox 5 with automated display rate chosen by system. But it seems something wrong with the hardware, so it keeps flickering. Especially when running more than 3 application, or running heavy graphical apps. I thought it already broken before I got this laptop. But then I thought about lowering the Refresh Rate.

The command is xrandr. First see the resolution supported by the hardware.

#sudo xrandr

Here is the result :

Screen 0: minimum 320 x 200, current 1360 x 768, maximum 8192 x 8192
eDP-1 connected primary 1360×768+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
1366×768 59.96 +
1360×768 59.80* 59.96
1024×768 60.04 60.00
960×720 60.00
928×696 60.05
896×672 60.01
960×600 60.00
960×540 59.99
800×600 60.00 60.32 56.25
840×525 60.01 59.88
800×512 60.17
700×525 59.98
640×512 60.02
720×450 59.89
640×480 60.00 59.94
680×384 59.80 59.96
576×432 60.06
512×384 60.00
400×300 60.32 56.34
320×240 60.05
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

Then I lower the resolution one step below and automatically with lower frequency.

#sudo xrandr -s 1360×768

I always failed when doing xrandr -s 1360×768 -r 59.80

So I skipped the -r option like many forum suggested.

Now, my display is not flickering anymore