Can't run steam games

[chandlerkc]

I have upgraded my gpu recently from a RX 550 to a GTX 960. With that said, I can only play OpenGL Games, Vulkan and lib32 rendered games are not playable anymore.

I am using Manjaro Pahvo 21.1.0 with linux kernel 5.12.19-1:

[chandler@chandler-PC ~]$ uname -a
Linux chandler-PC 5.12.19-1-MANJARO #1 SMP PREEMPT Tue Jul 20 20:57:37 UTC 2021 x86_64 GNU/Linux

These are my GPU specs from inxi:

Graphics:
Device-1: NVIDIA GM206 [GeForce GTX 960] driver: nouveau v: kernel
alternate: nvidia_drm,nvidia bus-ID: 0a:00.0 chip-ID: 10de:1401
class-ID: 0300
Display: x11 server: X.Org 1.20.13 compositor: kwin_x11 driver:
loaded: nouveau unloaded: modesetting alternate: fbdev,nv,vesa
display-ID: :0 screens: 1
Screen-1: 0 s-res: 2560x1440 s-dpi: 96 s-size: 676x380mm (26.6x15.0")
s-diag: 775mm (30.5")
Monitor-1: HDMI-1 res: 2560x1440 hz: 60 dpi: 107
size: 608x345mm (23.9x13.6") diag: 699mm (27.5")
OpenGL: renderer: NV126 v: 4.3 Mesa 21.1.6 direct render: Yes

These are my nvidia packages installed from the Official Repository:

When I try to launch nvidia-smi, it returns:

[chandler@chandler-PC ~]$ nvidia-smi
NVIDIA-SMI has failed because it couldn’t communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.

Could someone help me, please?

[megavolt]

@chandlerkc

Device-1: NVIDIA GM206 [GeForce GTX 960] driver: nouveau v: kernel
alternate: nvidia_drm,nvidia bus-ID: 0a:00.0 chip-ID: 10de:1401
class-ID: 0300

The nvidia driver is there, but you forgot to blacklist nouveau and therefore nouveau has been loaded first. This is normally done by using mhwd.

[chandlerkc]

Thank you so much, I have searched for more info and found this topic. bogdancovaciu gave a hint by telling to do:

sudo mhwd -r pci video-linux
then
sudo mhwd -i pci video-nvidia

After that, I rebooted the machine and now it is working!!

[chandlerkc]

Just a quick reminder:

Installing the proprietary nvidia drivers (I tried using 390 and 470), the fonts WILL be scaled up even with a correct font settings and setting the global scale to 100% in the compositor.

To overcome this issue, there is a thread closed in this forum recommending to force the driver to set a fixed DPI by editing (as sudo) the file /etc/X11/mhwd.d/nvidia.conf in the section "Monitor" by adding the line:

Option "DPI" "96 x 96"

and rebooting.