HDMI HDTV Blank on change input (Desktop,KDE,Kernel,Nvidia 455.38.1)

Hey Manjaro Forum folks.
This is been driving me crazy. Finally figured out what works for me so I thought I would share my results.

My Desktop PC Specs:

Kernel:    5.9.3-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 Desktop: KDE Plasma 5.20.2 Distro: Manjaro Linux
Machine:   Type: Desktop Mobo: ASUSTeK model: PRIME B450M-A v: Rev X.0x serial: <filter> UEFI: American Megatrends v: 2203 
           date: 07/28/2020 
Battery:   Device-1: hidpp_battery_0 model: Logitech Wireless Touch Keyboard K400 charge: 100% (should be ignored) 
           status: Discharging 
CPU:       Info: 6-Core model: AMD Ryzen 5 3600 bits: 64 type: MT MCP arch: Zen 2 L2 cache: 3072 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm bogomips: 86270 
           Speed: 2196 MHz min/max: 2200/3600 MHz boost: enabled Core speeds (MHz): 1: 2196 2: 2195 3: 2806 4: 1986 5: 2196 
           6: 1973 7: 3582 8: 1993 9: 2196 10: 2196 11: 2195 12: 2024 
Graphics:  Device-1: NVIDIA GM206 [GeForce GTX 950] vendor: eVga.com. driver: nvidia v: 450.80.02 bus ID: 09:00.0 
           Display: x11 server: X.Org 1.20.9 driver: nvidia resolution: 3840x2160 
           OpenGL: renderer: GeForce GTX 950/PCIe/SSE2 v: 4.6.0 NVIDIA 450.80.02 direct render: Yes 
Audio:     Device-1: NVIDIA GM206 High Definition Audio vendor: eVga.com. driver: snd_hda_intel v: kernel bus ID: 09:00.1 
           Device-2: Advanced Micro Devices [AMD] Starship/Matisse HD Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel 
           bus ID: 0b:00.4 
           Sound Server: ALSA v: k5.9.3-1-MANJARO 
Network:   Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK driver: r8169 v: kernel port: f000 
           bus ID: 08:00.0 
           IF: enp8s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 476.95 GiB used: 91.52 GiB (19.2%) 
           ID-1: /dev/nvme0n1 vendor: Silicon Power model: SPCC M.2 PCIe SSD size: 238.47 GiB 
           ID-2: /dev/sda vendor: Silicon Power model: SPCCSolidStateDisk size: 238.47 GiB 
Partition: ID-1: / size: 233.43 GiB used: 18.51 GiB (7.9%) fs: ext4 dev: /dev/nvme0n1p2 
Swap:      Alert: No Swap data was found. 
Sensors:   System Temperatures: cpu: 51.8 C mobo: N/A gpu: nvidia temp: 60 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 0% 
Info:      Processes: 287 Uptime: 25m Memory: 15.63 GiB used: 2.39 GiB (15.3%) Init: systemd Compilers: gcc: 10.2.0 
           Packages: 1277 Shell: Bash v: 5.0.18 inxi: 3.1.08 

PC is hooked up to a Vizio P55-F1 HDTV Max Res 3840x2160 60hz refresh rate. Initially I installed the latest NVIDIA driver 455.38.1 and every time i change the input on my TV HDMI and back to this PC HDMI input the screen won’t recognize it and the screen remains black. Also this happens when I turn off the TV and turn it back on. Researched HDPC compatibility issues and these didn’t bare fruit so I decided to revert back to older kernels to see if that would solve my issues like,, and finally and still the same even with 455.38.1 NVIDIA driver. Then I went back to kernel and used the Manjaro Settings Manager (GUI) Hardware Config and uninstalled NVIDIA 455 and installed 450 and now no issues. I noticed that when you uninstall an NVIDIA driver it wipes out the /etc/X11/mhwd.d/nvidia.conf file and any settings you may have made. Since it wiped out the old nvidia.conf I thought maybe i could reinstall the 455 driver and that may work but what ever i try the only one that works is the 450 driver.
Just thought I would document this in case someone else is going through this.
I even purchased an HDMI switch from Amazon so maybe if it was do to HDPC issues but now I know its software.
Thanks Great work Manjaro Team.

I’m having a similar issue. When I turn my monitor off or it turns it of because of the power settings, I get a black screen until I do CTRL ALT F2 and CTRL ALT F1, then it returns to normal but kwin displays a message that desktop effects have been reset)

Operating System: Manjaro Linux
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.77.0
Qt Version: 5.15.2
Kernel Version: 5.9.11-3-MANJARO
OS Type: 64-bit
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31,3 GiB of RAM
Graphics Processor: GeForce GTX 1080/PCIe/SSE2
NVIDIA-SMI 455.45.01

I have the same issue. Any time the monitor is turned off, I can only get back to my desktop GUI by pressing CTRL+ALT+F2 and then ALT+F7.

I have a single LG 32UK550/UL500 monitor connected through HDMI, running at 4k60.

I reviewed downgrading my NVIDIA driver from Manjaro Settings Manager (GUI), but I can’t see an option to do that there.

These are my settings:

Kernel: 5.4.101-1-MANJARO x86_64 bits: 64 
  Desktop: Xfce 4.16.0 Distro: Manjaro Linux 
  Device-1: NVIDIA TU116 [GeForce GTX 1660] driver: nvidia v: 460.56 
  Display: x11 server: X.Org 1.20.10 driver: loaded: nvidia 
  resolution: 3840x2160~60Hz 
  OpenGL: renderer: GeForce GTX 1660/PCIe/SSE2 v: 4.6.0 NVIDIA 460.56