Problem running `nvidia-xrun`. Unable to load driver.

Output for inxi -Fx :

System:    Host: manjaro Kernel: 5.0.9-2-MANJARO x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Gnome 3.32.1 
           Distro: Manjaro Linux 
Machine:   Type: Laptop System: Dell product: G3 3579 v: N/A serial: <root required> 
           Mobo: Dell model: 03TF0Y v: A00 serial: <root required> UEFI: Dell v: 1.5.1 date: 11/01/2018 
Battery:   ID-1: BAT0 charge: 29.4 Wh condition: 42.0/56.0 Wh (75%) model: Samsung SDI DELL W7NKD87 status: Discharging 
           Device-1: hidpp_battery_0 model: Logitech Wireless Mouse charge: 55% (should be ignored) status: Discharging 
CPU:       Topology: 6-Core model: Intel Core i7-8750H bits: 64 type: MT MCP arch: Kaby Lake rev: A L2 cache: 9216 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 53004 
           Speed: 800 MHz min/max: 800/4100 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 5: 800 6: 800 7: 800 8: 800 
           9: 800 10: 800 11: 800 12: 800 
Graphics:  Device-1: Intel UHD Graphics 630 vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 
           Device-2: NVIDIA GP107M [GeForce GTX 1050 Ti Mobile] driver: nouveau v: kernel bus ID: 01:00.0 
           Display: x11 server: 1.20.4 driver: modesetting resolution: <xdpyinfo missing> 
           OpenGL: renderer: Mesa DRI Intel UHD Graphics 630 (Coffeelake 3x8 GT2) v: 4.5 Mesa 19.0.3 direct render: Yes 
Audio:     Device-1: Intel Cannon Lake PCH cAVS vendor: Dell driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
           Sound Server: ALSA v: k5.0.9-2-MANJARO 
Network:   Device-1: Intel Wireless-AC 9560 [Jefferson Peak] driver: iwlwifi v: kernel port: 5000 bus ID: 00:14.3 
           IF: wlo1 state: up mac: 20:16:b9:93:a5:8a 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: Dell driver: r8169 v: kernel port: 3000 
           bus ID: 02:00.0 
           IF: enp2s0 state: down mac: 54:bf:64:43:f5:aa 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 1.03 TiB used: 387.56 GiB (36.9%) 
           ID-1: /dev/sda vendor: Western Digital model: WD10SPZX-75Z10T1 size: 931.51 GiB 
           ID-2: /dev/sdb vendor: Samsung model: SSD PM871b M.2 2280 128GB size: 119.24 GiB 
RAID:      Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci v: 3.0 bus ID: 00:17.0 
Partition: ID-1: / size: 194.84 GiB used: 34.63 GiB (17.8%) fs: ext3 dev: /dev/sda3 
Sensors:   System Temperatures: cpu: 54.0 C mobo: N/A gpu: nouveau temp: 40 C 
           Fan Speeds (RPM): N/A 
Info:      Processes: 317 Uptime: 1h 38m Memory: 7.65 GiB used: 2.67 GiB (34.8%) Init: systemd Compilers: gcc: 8.3.0 
           Shell: zsh v: 5.7.1 inxi: 3.0.33 

Whenever i try to load nvidia-xrun it gives me following error:

modprobe: ERROR: could not insert 'nvidia': No such device
modprobe: ERROR: could not insert 'nvidia_drm': No such device

How do i solve this problem?

That nouveau means you do not have any nvidia driver installed. For optimus laptops you have this options:

Read about them and chose only one solution.

I have already installed nvidia. Just checked in pamac.

So, did you reboot? By the inxi provided you don't have it. If you installed via pamac then you did a mistake. You have to use the mhwd ...

Ok, i have installed nvidia-xrun via pamac, it asked me to install an nvidia provider where i selected linux50-nvidia, and then i went to /etc/modprobe.d/blacklist.conf and blacklisted nouveau, appending blacklist nouveau.

I have already tried mhwd method but it isnt working thats why i decided to do it manually.

My notebook is DELL G3 15 (GTX 1050Ti). still its not working. where am i going wrong?

I provided you a link where are explained for each existing option, the proper way to get nvidia working with proprietary drivers on optimus laptops. The thing is that not all of those work for all laptops. From my point of view, the best approach is the use of optimus-switch.

Regarding your choice to use nvidia-xrun ... best to address any issues about it to @Witko on github and make sure you followed 100% the how to

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