this post was submitted on 16 Feb 2025
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artifacts on screen with Nvidia drivers when using an ultrawide monitor (self.linux_gaming)
submitted 3 days ago* (last edited 3 days ago) by philthi to c/linux_gaming
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Hey everyone,

I have a gaming laptop with fedora installed and in general have no problems with it. However I would like to play some games on it from Steam.

So I installed the Nvidia drivers and when the laptop is not using an external monitor it's great, the games performance are 10/10.

However I most often use my laptop plugged into an ultrawide monitor and when I do that with the Nvidia driver active all sorts of strangle artifacts show up on the screen and the edges go blue and shudder, this slowly gets worse over the course of about 15 minutes until I cannot use the laptop at all and need to reboot.

Using the built in drivers the ultrawide monitor is completely fine, but games run very poorly.

Does any one have any experience with this, and any idea if there's something I can do to correct it?

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[–] philthi 1 points 3 days ago (1 children)

Here are some photos:

[–] philthi 2 points 3 days ago (1 children)

Eventually the entire screen is flickering and flashing, but I can't upload a video.

Weirdly xrandr doesn't list 3840x1080 as an option, even though the display settings do (and it works fine at that resolution with the default driver).

It does seem pretty stable at 2560x1080, but it looks horrendous, stretched horizontally.

[–] [email protected] 3 points 3 days ago (2 children)

What cable do you use? 3840x1080 @ 60Hz is 6.18 Gbit/s. You need at least HDMI 1.3 cable, 1.0 and 1.2 max is 3.96 Gbit/s. If you want higher fps, you will need at least a HDMI 2.0 cable for that resolution.

https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_common_resolutions

This can be a reason why smaller resolutions are fine, that data can be transmitted on the cable.

[–] philthi 1 points 3 days ago (1 children)

I don't know what quality the cable is, however considering the image quality is fine at that resolution with the default drivers makes me suspect that the cable is not the problem.

[–] [email protected] 1 points 2 days ago* (last edited 2 days ago) (1 children)

If I were you I would by a 2.0 cable just to rule this out. As I see you didn't got a lot of tips.

[–] philthi 1 points 2 days ago

Ok, I'll look into what quality my HDMI cable is, thanks :)

[–] [email protected] 1 points 3 days ago* (last edited 3 days ago)

This. I had weird refresh rates showing up for my older 4K TV until I got a HDMI 2.1 cable, especially KDE Plasma... topped out at 30Hz for some reason. Got a "Highwings" 8K cable which was cheap but seems decent quality. Don't get excess length if you don't need it.