# GBM does not work with Hyprland/Sway, games have FPS drops below 30 every few mins **URL:** \ **Category:** Linux\ **Tags:** linux-driver\ **Created:** [October 31, 2023, 5:37am UTC](https://forums.developer.nvidia.com/t/gbm-does-not-work-with-hyprland-sway-games-have-fps-drops-below-30-every-few-mins/271268 "2023-10-31T05:37:01Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![LazarusCat59](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@LazarusCat59](https://forums.developer.nvidia.com/u/LazarusCat59)\ **Post date:** [October 31, 2023, 5:37am UTC](https://forums.developer.nvidia.com/t/gbm-does-not-work-with-hyprland-sway-games-have-fps-drops-below-30-every-few-mins/271268/1 "2023-10-31T05:37:01Z")
I have a laptop with an Intel UHD 630 and NVIDIA GTX 1660Ti with NVIDIA PRIME offloading set up. Plugging in a monitor works fine and I can use it, except if I try to use NVIDIA GBM backend with `GBM_BACKEND=nvidia-drm`, Hyprland/Sway crashes. I’m on Arch Linux with kernel 6.5.9-zen2-1-zen and NVIDIA driver version 535.113.01, using Hyprland since Sway has flickering issues. Here’s a relevant Hyprland issue which might have some more details: [#1878](https://github.com/hyprwm/Hyprland/issues/1878). Also, my FPS drops down below 30 every few minutes in most games on my external monitor. Didn’t used to have this issue before when I was only using my laptop monitor. Temperatures seem to be staying the same as it used to be with only the laptop monitor so it can’t be thermal throttling, although I do not know of a way to confirm it for sure. Thought it might be some weird issue with PRIME so I tried running external monitor on only NVIDIA card using `WLR_DRM_DEVICES=/dev/dri/card1` to pick the NVIDIA card which I got the same results with. Nothing much else I’ve found that I can try, so creating a bug report which hopefully helps fix this. [nvidia-bug-report.log.gz](https://forums.developer.nvidia.com/uploads/short-url/bXELCDGfb0epda7IJx2eRZ5spp5.gz) (643.7 KB) ---
**Author:** ![LazarusCat59](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@LazarusCat59](https://forums.developer.nvidia.com/u/LazarusCat59)\ **Post date:** [November 4, 2023, 5:55pm UTC](https://forums.developer.nvidia.com/t/gbm-does-not-work-with-hyprland-sway-games-have-fps-drops-below-30-every-few-mins/271268/2 "2023-11-04T17:55:04Z")
Update: Without `WLR_DRM_DEVICES=/dev/dri/card0` (it changed since I did a full reinstall) Hyprland and Sway both crash when the GBM backend is enabled but currently with sway-git and `WLR_DRM_DEVICES=/dev/dri/card0`, Sway does not crash. However, Hyprland still crashes with or without the variable if I try to enable the GBM backend. Sway does crash if I am not exclusively using the NVIDIA GPU using `WLR_DRM_DEVICES=/dev/dri/card0`. Update 2: Hyprland and Sway no longer crashes with `GBM_BACKEND=nvidia-drm` as of NVIDIA driver version 545.29.02 with or without `WLR_DRM_DEVICES=/dev/dri/card0`. However, the FPS drops remain. Update 3: Tried my best to confirm that my CPU was not thermal throttling by disabling thermald daemon and auto-cpufreq, then trying [throttled](https://github.com/erpalma/throttled) to make sure my CPU is not being throttled early. Still having the FPS drops on both Hyprland and Sway, regardless of whether `WLR_DRM_DEVICES=/dev/dri/card0` variable is present or not. ---
**Author:** ![LazarusCat59](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@LazarusCat59](https://forums.developer.nvidia.com/u/LazarusCat59)\ **Post date:** [November 13, 2023, 12:28pm UTC](https://forums.developer.nvidia.com/t/gbm-does-not-work-with-hyprland-sway-games-have-fps-drops-below-30-every-few-mins/271268/3 "2023-11-13T12:28:17Z")
Nevermind, I’m dumb. CPU was indeed thermal throttling, had zero FPS drops when I tried disabling BD PROCHOT. It was kinda weird that it only happened when external monitor was plugged in and since it didn’t happen on Windows I went ahead and assumed it wasn’t related to throttling but now it’s all fine. ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [November 27, 2023, 12:28pm UTC](https://forums.developer.nvidia.com/t/gbm-does-not-work-with-hyprland-sway-games-have-fps-drops-below-30-every-few-mins/271268/4 "2023-11-27T12:28:26Z")
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