Second screen doent show fullscreen videos

Hello Guys,
I got the followign problem. my second screen isnt showing any video if its on fuillscreen. It just showing a black screen. Any idea what the problem is?
The manjaro installation is complety fresh.

Please post your system info as outlined here:

Sorry about that i though i posted under the kde plasma section or the post got moved. So

$inxi --admin --verbosity=7 --filter --no-host --width
System:
  Kernel: 5.10.42-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64 
  root=UUID=7e2c063a-f753-4448-96a4-3f85f0d2a8fb rw quiet apparmor=1 
  security=apparmor udev.log_priority=3 
  Desktop: KDE Plasma 5.21.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM 
  Distro: Manjaro Linux base: Arch Linux 
Machine:
  Type: Desktop Mobo: ASRock model: Z68 Pro3 serial: <filter> 
  BIOS: American Megatrends v: P1.30 date: 05/19/2011 
Battery:
  Message: No system battery data found. Is one present? 
Memory:
  RAM: total: 15.55 GiB used: 1.76 GiB (11.3%) 
  RAM Report: permissions: Unable to run dmidecode. Root privileges required. 
CPU:
  Info: Quad Core model: Intel Core i5-2500K bits: 64 type: MCP 
  arch: Sandy Bridge family: 6 model-id: 2A (42) stepping: 7 microcode: 2F 
  cache: L2: 6 MiB bogomips: 26350 
  Speed: 4276 MHz min/max: 1600/6000 MHz Core speeds (MHz): 1: 4276 2: 4268 
  3: 2390 4: 4017 
  Flags: acpi aes aperfmperf apic arat arch_perfmon avx bts clflush cmov 
  constant_tsc cpuid cx16 cx8 de ds_cpl dtes64 dtherm dts epb ept est 
  flexpriority flush_l1d fpu fxsr ht ibpb ibrs ida lahf_lm lm mca mce md_clear 
  mmx monitor msr mtrr nonstop_tsc nopl nx pae pat pbe pcid pclmulqdq pdcm 
  pebs pge pln pni popcnt pse pse36 pti pts rdtscp rep_good sep ssbd sse sse2 
  sse4_1 sse4_2 ssse3 stibp syscall tm tm2 tpr_shadow tsc tsc_deadline_timer 
  vme vmx vnmi vpid xsave xsaveopt xtopology xtpr 
  Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled 
  Type: l1tf 
  mitigation: PTE Inversion; VMX: conditional cache flushes, SMT disabled 
  Type: mds mitigation: Clear CPU buffers; SMT disabled 
  Type: meltdown mitigation: PTI 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, 
  IBRS_FW, STIBP: disabled, RSB filling 
  Type: srbds status: Not affected 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: Intel 2nd Generation Core Processor Family Integrated Graphics 
  vendor: ASRock driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:0112 
  class-ID: 0380 
  Device-2: NVIDIA GP104 [GeForce GTX 1080] vendor: eVga.com. driver: nvidia 
  v: 465.31 alternate: nouveau,nvidia_drm bus-ID: 01:00.0 chip-ID: 10de:1b80 
  class-ID: 0300 
  Device-3: WaveRider USB Live camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 2-1.1.2:8 chip-ID: 0c46:64ab class-ID: 0102 serial: <filter> 
  Device-4: Focusrite-Novation Scarlett 2i2 Camera type: USB 
  driver: snd-usb-audio,usb-storage bus-ID: 2-1.5:5 chip-ID: 1235:8210 
  class-ID: 0806 serial: <filter> 
  Display: x11 server: X.Org 1.20.11 compositor: kwin_x11 driver: 
  loaded: nvidia display-ID: :0 screens: 1 
  Screen-1: 0 s-res: 3840x1080 s-dpi: 81 s-size: 1204x343mm (47.4x13.5") 
  s-diag: 1252mm (49.3") 
  Monitor-1: HDMI-0 res: 1920x1080 hz: 60 dpi: 82 size: 598x336mm (23.5x13.2") 
  diag: 686mm (27") 
  Monitor-2: DP-0 res: 1920x1080 hz: 60 dpi: 93 size: 527x296mm (20.7x11.7") 
  diag: 604mm (23.8") 
  OpenGL: renderer: NVIDIA GeForce GTX 1080/PCIe/SSE2 v: 4.6.0 NVIDIA 465.31 
  direct render: Yes 
Audio:
  Device-1: Intel 6 Series/C200 Series Family High Definition Audio 
  vendor: ASRock driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 
  chip-ID: 8086:1c20 class-ID: 0403 
  Device-2: NVIDIA GP104 High Definition Audio vendor: eVga.com. 
  driver: snd_hda_intel v: kernel bus-ID: 01:00.1 chip-ID: 10de:10f0 
  class-ID: 0403 
  Device-3: WaveRider USB Live camera type: USB driver: snd-usb-audio,uvcvideo 
  bus-ID: 2-1.1.2:8 chip-ID: 0c46:64ab class-ID: 0102 serial: <filter> 
  Device-4: Samson Q1U dynamic microphone type: USB driver: snd-usb-audio 
  bus-ID: 2-1.1.3:9 chip-ID: 17a0:0002 class-ID: 0102 
  Device-5: Focusrite-Novation Scarlett 2i2 Camera type: USB 
  driver: snd-usb-audio,usb-storage bus-ID: 2-1.5:5 chip-ID: 1235:8210 
  class-ID: 0806 serial: <filter> 
  Sound Server-1: ALSA v: k5.10.42-1-MANJARO running: yes 
  Sound Server-2: JACK v: 0.125.0 running: no 
  Sound Server-3: PulseAudio v: 14.2 running: yes 
  Sound Server-4: PipeWire v: 0.3.30 running: yes 
Network:
  Device-1: Intel Wireless 8260 driver: iwlwifi v: kernel port: e000 
  bus-ID: 03:00.0 chip-ID: 8086:24f3 class-ID: 0280 
  IF: wlp3s0 state: up mac: <filter> 
  IP v4: <filter> type: dynamic noprefixroute scope: global 
  broadcast: <filter> 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: dynamic noprefixroute scope: global 
  IP v6: <filter> type: noprefixroute scope: link 
  Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASRock driver: r8169 v: kernel port: d000 bus-ID: 06:00.0 
  chip-ID: 10ec:8168 class-ID: 0200 
  IF: enp6s0 state: down mac: <filter> 
  WAN IP: <filter> 
Bluetooth:
  Device-1: Intel Bluetooth wireless interface type: USB driver: btusb v: 0.8 
  bus-ID: 1-1.3:3 chip-ID: 8087:0a2b class-ID: e001 
  Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends 
Logical:
  Permissions: Unable to run lvs. Root privileges required. 
RAID:
  Message: No RAID data found. 
Drives:
  Local Storage: total: 2.39 TiB used: 343.18 GiB (14.0%) 
  SMART Message: Unable to run smartctl. Root privileges required. 
  ID-1: /dev/sda maj-min: 8:0 vendor: Crucial model: CT1000MX500SSD1 
  size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  rotation: SSD serial: <filter> rev: 033 scheme: MBR 
  ID-2: /dev/sdb maj-min: 8:16 vendor: Crucial model: CT500MX500SSD1 
  size: 465.76 GiB block-size: physical: 4096 B logical: 512 B speed: 6.0 Gb/s 
  rotation: SSD serial: <filter> rev: 022 
  ID-3: /dev/sdc maj-min: 8:32 vendor: Crucial model: M4-CT128M4SSD2 
  size: 119.24 GiB block-size: physical: 512 B logical: 512 B speed: 3.0 Gb/s 
  rotation: SSD serial: <filter> rev: 000F scheme: GPT 
  ID-4: /dev/sdd maj-min: 8:48 vendor: Seagate model: ST1000DM003-9YN162 
  size: 931.51 GiB block-size: physical: 4096 B logical: 512 B speed: 3.0 Gb/s 
  rotation: 7200 rpm serial: <filter> rev: CC4D scheme: MBR 
  ID-5: /dev/sde maj-min: 8:64 type: USB model: Scarlett Welcome Disk 
  size: 192 KiB block-size: physical: 512 B logical: 512 B serial: <filter> 
  rev: 0.10 scheme: MBR 
  SMART Message: Unknown USB bridge. Flash drive/Unsupported enclosure? 
  Message: No optical or floppy data found. 
Partition:
  ID-1: / raw-size: 931.51 GiB size: 915.81 GiB (98.31%) 
  used: 16.44 GiB (1.8%) fs: ext4 dev: /dev/sda1 maj-min: 8:1 label: N/A 
  uuid: 7e2c063a-f753-4448-96a4-3f85f0d2a8fb 
  ID-2: /mnt/Datein raw-size: 465.76 GiB size: 457.45 GiB (98.22%) 
  used: 326.74 GiB (71.4%) fs: ext4 dev: /dev/sdb maj-min: 8:16 label: Datein 
  uuid: f1410e76-c428-4640-bdd4-57e544df74e9 
Swap:
  Alert: No swap data was found. 
Unmounted:
  ID-1: /dev/sdc1 maj-min: 8:33 size: 499 MiB fs: <superuser required> 
  label: Wiederherstellung uuid: 160C9C320C9C0F3D 
  ID-2: /dev/sdc2 maj-min: 8:34 size: 100 MiB fs: <superuser required> 
  label: N/A uuid: 789E-ED08 
  ID-3: /dev/sdc3 maj-min: 8:35 size: 16 MiB fs: <superuser required> 
  label: N/A uuid: N/A 
  ID-4: /dev/sdc4 maj-min: 8:36 size: 118.64 GiB fs: <superuser required> 
  label: N/A uuid: 7476B6C076B68302 
  ID-5: /dev/sdd1 maj-min: 8:49 size: 931.51 GiB fs: <superuser required> 
  label: Multimedia uuid: ad7f6a0a-d0d2-4a88-bd0d-506ef7c014c9 
  ID-6: /dev/sde1 maj-min: 8:65 size: 160 KiB fs: <superuser required> 
  label: SCARLETT uuid: 8886-5B6C 
USB:
  Hub-1: 1-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-2: 1-1:2 info: Intel Integrated Rate Matching Hub ports: 6 rev: 2.0 
  speed: 480 Mb/s chip-ID: 8087:0024 class-ID: 0900 
  Device-1: 1-1.3:3 info: Intel Bluetooth wireless interface type: Bluetooth 
  driver: btusb interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 100mA 
  chip-ID: 8087:0a2b class-ID: e001 
  Hub-3: 2-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-4: 2-1:2 info: Intel Integrated Rate Matching Hub ports: 8 rev: 2.0 
  speed: 480 Mb/s chip-ID: 8087:0024 class-ID: 0900 
  Hub-5: 2-1.1:3 info: Terminus Hub ports: 4 rev: 2.0 speed: 480 Mb/s 
  power: 100mA chip-ID: 1a40:0101 class-ID: 0900 
  Device-1: 2-1.1.1:6 info: Alcor Micro AU6477 Card Reader Controller 
  type: Mass Storage,HID driver: hid-generic,usb-storage,usbhid interfaces: 2 
  rev: 2.0 speed: 480 Mb/s power: 250mA chip-ID: 058f:6364 class-ID: 0300 
  serial: <filter> 
  Device-2: 2-1.1.2:8 info: WaveRider USB Live camera type: Video,Audio 
  driver: snd-usb-audio,uvcvideo interfaces: 4 rev: 2.0 speed: 480 Mb/s 
  power: 500mA chip-ID: 0c46:64ab class-ID: 0102 serial: <filter> 
  Device-3: 2-1.1.3:9 info: Samson Q1U dynamic microphone type: Audio 
  driver: snd-usb-audio interfaces: 2 rev: 1.1 speed: 12 Mb/s power: 90mA 
  chip-ID: 17a0:0002 class-ID: 0102 
  Device-4: 2-1.2:4 info: Logitech Logi TKL Mechanical Keyboard 
  type: Keyboard,HID driver: hid-generic,usbhid interfaces: 3 rev: 2.0 
  speed: 12 Mb/s power: 100mA chip-ID: 046d:c345 class-ID: 0300 
  Device-5: 2-1.5:5 info: Focusrite-Novation Scarlett 2i2 Camera 
  type: Audio,Mass Storage driver: snd-usb-audio,usb-storage interfaces: 5 
  rev: 2.1 speed: 480 Mb/s power: 500mA chip-ID: 1235:8210 class-ID: 0806 
  serial: <filter> 
  Device-6: 2-1.6:7 info: Logitech M-U0007 [Corded Mouse M500] type: Mouse 
  driver: hid-generic,usbhid interfaces: 1 rev: 2.0 speed: 1.5 Mb/s 
  power: 98mA chip-ID: 046d:c069 class-ID: 0301 
  Hub-6: 3-0:1 info: Full speed (or root) Hub ports: 2 rev: 2.0 
  speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900 
  Hub-7: 4-0:1 info: Full speed (or root) Hub ports: 2 rev: 3.0 speed: 5 Gb/s 
  chip-ID: 1d6b:0003 class-ID: 0900 
Sensors:
  System Temperatures: cpu: 58.0 C mobo: N/A gpu: nvidia temp: 52 C 
  Fan Speeds (RPM): N/A gpu: nvidia fan: 18% 
Info:
  Processes: 218 Uptime: 1m wakeups: 0 Init: systemd v: 248 tool: systemctl 
  Compilers: gcc: N/A Packages: pacman: 1185 lib: 323 flatpak: 0 Shell: Bash 
  v: 5.1.8 running-in: konsole inxi: 3.3.04 

and

$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DVI-D-0 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080     60.00*+  59.94    50.00    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-0 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
   1920x1080     60.00*+  59.94    50.00  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    59.94    59.93  
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)