Same result Kai-Heng. :(

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https://bugs.launchpad.net/bugs/1871721

Title:
  Second Monitor on HDMI blank screen/blink screen with Nvidia + Intel &
  Ubuntu 20.04? (ASUS Laptop)

Status in kernel-package package in Ubuntu:
  Confirmed
Status in mesa package in Ubuntu:
  Confirmed
Status in nouveau-firmware package in Ubuntu:
  Confirmed
Status in nvidia-graphics-drivers-440 package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  I installed Ubuntu 20.04 on my ASUS laptop with Intel+Nvidia with propietary 
drivers of Nvidia (I have 440.64 rn) and I connected a second monitor to use 
it, but I saw that I cannot use it, I just see a blank screen. I tried with a 
TV of my room and same. The funny part is when I start the laptop to work, I 
can see the logo of my BIOS and the ASUS logo in the second monitor, even the 
grub, but after that I can't see nothing.
  When I reduce the resolution of the second monitor (800x600) then works, but 
even with that sometimes blinks to black again.
  On W10 for example it works perfectly, so I deduce it's not 'cause my HDMI.

  I tried with nouveau drivers and I have the same results btw.

  Laptop Asus with:
  Graphic card ---- Nvidia GTX960M
  Processor -------- Intel i5 6300

  I tried with Nvidia Prime to Nvidia, Intel and On-demand. None of them
  works. All of them with Xorg.

  I have this with xrandr:

  Screen 0: minimum 8 x 8, current 2720 x 1080, maximum 16384 x 16384
  eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y 
axis) 344mm x 193mm
     1920x1080     60.00*+  59.97    59.96    59.93
     1680x1050     59.95    59.88
     1600x1024     60.17
     1400x1050     59.98
     1600x900      59.99    59.94    59.95    59.82
     1280x1024     60.02
     1440x900      59.89
     1400x900      59.96    59.88
     1280x960      60.00
     1440x810      60.00    59.97
     1368x768      59.88    59.85
     1360x768      59.80    59.96
     1280x800      59.99    59.97    59.81    59.91
     1152x864      60.00
     1280x720      60.00    59.99    59.86    59.74
     1024x768      60.04    60.00
     960x720       60.00
     928x696       60.05
     896x672       60.01
     1024x576      59.95    59.96    59.90    59.82
     960x600       59.93    60.00
     960x540       59.96    59.99    59.63    59.82
     800x600       60.00    60.32    56.25
     840x525       60.01    59.88
     864x486       59.92    59.57
     800x512       60.17
     700x525       59.98
     800x450       59.95    59.82
     640x512       60.02
     720x450       59.89
     700x450       59.96    59.88
     640x480       60.00    59.94
     720x405       59.51    58.99
     684x384       59.88    59.85
     680x384       59.80    59.96
     640x400       59.88    59.98
     576x432       60.06
     640x360       59.86    59.83    59.84    59.32
     512x384       60.00
     512x288       60.00    59.92
     480x270       59.63    59.82
     400x300       60.32    56.34
     432x243       59.92    59.57
     320x240       60.05
     360x202       59.51    59.13
     320x180       59.84    59.32
  DP-1-1 disconnected (normal left inverted right x axis y axis)
  HDMI-1-1 disconnected (normal left inverted right x axis y axis)
  HDMI-1-2 connected 800x600+1920+0 (normal left inverted right x axis y axis) 
1600mm x 900mm
     1920x1080     60.00 +  50.00    59.94    30.00    25.00    24.00    29.97  
  23.98
     1920x1080i    60.00    50.00    59.94
     1280x1024     60.02
     1360x768      60.02
     1152x864      59.97
     1280x720      59.81    60.00    50.00    59.94
     1024x768      60.00
     800x600       60.32*
     720x576       50.00
     720x576i      50.00
     720x480       60.00    59.94
     640x480       60.00    59.94
     720x400       70.08
  DP-1-2 disconnected (normal left inverted right x axis y axis)
  HDMI-1-3 disconnected (normal left inverted right x axis y axis)

  PD: When you select a specific resolution, the second monitor "works",
  but it blinks, the image showed via HDMI on the second monitor blinks.
  So is impossible to work with it. Since all this time I was searching
  about this and I'm almost sure this is a problem of the GPU's Intel.
  But I saw this problem on askubuntu just with laptops with hybrid
  graphics. Always with Nvidia+Intel. (Maybe AMD+Nvidia too, but I'm not
  sure if they have the same problem here).

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