(ASUS) Intel GPU HDMI Ubuntu 20.04 Second Monitor on HDMI blank screen/blink screen (laptop hybrid with Nvidia)

I installed Ubuntu 20.04 on my ASUS laptop with Intel+Nvidia! and I connected a second monitor to use it, but I saw that I cannot use it, I just see a blank screen (or just it blinks if I use a low resolution). 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 or TV.

PS: Tried with Xorg and Wayland. Tried with Mesa ver. default of Ubuntu 20.04 and the last version of git.

PS2: ----------- Since the ver. 4.16 of kernel the second monitor doesn't work. It was working on 4.15.

uname -m x86_64

uname -r 5.8.0-050800drmtip20200710-generic

xrandr --verbose Screen 0: minimum 16 x 16, current 2944 x 1080, maximum 32767 x 32767

• XWAYLAND1 connected 1920x1080+0+0 (0x25) normal (normal left inverted right x axis y axis) 340mm x 190mm Identifier: 0x23 Timestamp: 53362 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 0.0 Clones:
  CRTC: 0 CRTCs: 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: non-desktop: 0 supported: 0, 1 1920x1080 (0x25) 173.000MHz -HSync +VSync *current +preferred h: width 1920 start 2048 end 2248 total 2576 skew 0 clock 67.16KHz v: height 1080 start 1083 end 1088 total 1120 clock 59.96Hz

• XWAYLAND2 connected 1024x768+1920+0 (0x546) normal (normal left inverted right x axis y axis) 1600mm x 900mm Identifier: 0x544 Timestamp: 53362 Subpixel: unknown Gamma: 1.0:1.0:1.0 Brightness: 0.0 Clones:
  CRTC: 1 CRTCs: 1 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: non-desktop: 0 supported: 0, 1 1024x768 (0x546) 63.500MHz -HSync +VSync *current +preferred h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.82KHz v: height 768 start 771 end 775 total 798 clock 59.92Hz

• dmi.bios.date: 04/25/2019

• dmi.bios.vendor: American Megatrends Inc.

• dmi.bios.version: GL552VW.304

• dmi.board.asset.tag: ATN12345678901234567

• dmi.board.name: GL552VW

• dmi.board.vendor: ASUSTeK COMPUTER INC.

• dmi.board.version: 1.0

• dmi.chassis.asset.tag: ATN12345678901234567

• dmi.chassis.type: 10

• dmi.chassis.vendor: ASUSTeK COMPUTER INC.

• dmi.chassis.version: 1.0

• dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrGL552VW.304:bd04/25/2019:svnASUSTeKCOMPUTERINC.:pnGL552VW:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnGL552VW:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:

• dmi.product.family: GL

• dmi.product.name: GL552VW

• dmi.product.sku: ASUS-NotebookSKU

• dmi.product.version: 1.0

• dmi.sys.vendor: ASUSTeK COMPUTER INC.

• version.compiz: compiz N/A

• version.libdrm2: libdrm2 2.4.102+git2006181830.f44908oibaff

• version.libgl1-mesa-dri: libgl1-mesa-dri 20.2git2007090730.02a578oibaf~f

• version.libgl1-mesa-glx: libgl1-mesa-glx N/A

• version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A

• version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.1

• version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A

• version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1

• version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.

dmesg

There's a video to show how works the second monitor if I adjust a low resolution. If I try with more resolution it doesn't work (on W10 it does perfectly on 1920x1080) VID_20200715_192517_163

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This is the first bad commit. https://patchwork.freedesktop.org/patch/199817/