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Possible regression with latest nvidia driver

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heretic
Posts: 7
Joined: 24 Sep 2019 07:43

Possible regression with latest nvidia driver

#1 Post by heretic » 24 Sep 2019 07:51

Hello everyone,
Im playing both ATS and ETS2 primarily on my linux machine and it works great, however after latest nvidia driver update i noticed strange fps drops in certain cases. I'd like to know if it is just me and my computer, or should i report this to nvidia, but first i'd like to know. If any of fellow linux players with nvidia hardware could confirm this it would be great. Now to the point, the problem occurs when camera is pointed at light reflection, let it be when closing up to another truck on red light, the moment lights from my truck reflect car in front of me fps drop significantly. By that i mean from 60 to 15, it returns back to normal when the reflection is gone. This problem appeared after nvidia 435.21 driver update. Reverting back to 418.52.20 (vulkan beta, i used it for dxvk but the previous short lived stable driver was good too) fixes the problem.

Leopard- Linux
Posts: 62
Joined: 26 Jan 2019 00:15

Re: Possible regression with latest nvidia driver

#2 Post by Leopard- Linux » 25 Sep 2019 09:36

I'm on 435.21 too and didn't observe such a problem.

heretic
Posts: 7
Joined: 24 Sep 2019 07:43

Re: Possible regression with latest nvidia driver

#3 Post by heretic » 26 Sep 2019 07:56

thanks for your reply. what is your gpu?
does anyone know if nvidia has some kind of shader cache other than ~/.nv ?

Leopard- Linux
Posts: 62
Joined: 26 Jan 2019 00:15

Re: Possible regression with latest nvidia driver

#4 Post by Leopard- Linux » 26 Sep 2019 14:30

GTX 1050 4 GB ( mobile variant has 4 gb )

That shader cache directory is not you are looking for if you have Steam Shader cache sharing enabled.

.local/share/Steam/steamapps/shadercache/227300

That is the place where both locally compiled shaders and shaders coming from swarm are stored.

heretic
Posts: 7
Joined: 24 Sep 2019 07:43

Re: Possible regression with latest nvidia driver

#5 Post by heretic » 26 Sep 2019 18:50

thanks. I checked the issue with shader cache sharing disabled but it is still there so it is not shader problem. Meanwhile i reinstalled my Fedora system to newest version (31 Beta) so im now on clean install, picked up the nvidia 435.21 driver and it is still there. Do you use force full composition pipeline? I just noticed it doesn't slow down when i disable this option in nvidia-settings, but then screen tearing appears (I have 60hz screen).

Leopard- Linux
Posts: 62
Joined: 26 Jan 2019 00:15

Re: Possible regression with latest nvidia driver

#6 Post by Leopard- Linux » 26 Sep 2019 22:12

Nope. I don't. I'm on an Optimus laptop which i'm using it with PrimeSync for zero tearing.

heretic
Posts: 7
Joined: 24 Sep 2019 07:43

Re: Possible regression with latest nvidia driver

#7 Post by heretic » 27 Sep 2019 09:51

Could you try enabling full composition pipeline and check if you notice any significant fps drops?

Leopard- Linux
Posts: 62
Joined: 26 Jan 2019 00:15

Re: Possible regression with latest nvidia driver

#8 Post by Leopard- Linux » 28 Sep 2019 10:28

I don't have such an option at Nvidia X server settings , like it does happen on any Optimus laptops ( Intel igpu + Nvidia dgpu )

heretic
Posts: 7
Joined: 24 Sep 2019 07:43

Re: Possible regression with latest nvidia driver

#9 Post by heretic » 21 Oct 2019 11:03

So i gave it a go with latest Beta driver 440.26 and the slowdown was still there. A little bit frustrated, i decided to generate a new xorg.conf with new nvidia-settings and added the Option "TripleBuffer" on to device section and to my suprise it eliminated the fps drops. So it either required to generate a new xorg.conf or the TripleBuffer solved my issue.

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