Thanks for the report!
With framegen on game doesn't work great though, drops fps badly permanently in a few minutes and feels stuttery.
This part looks like a vkd3d-proton issue. After a few minutes of gameplay I notice that vkd3d-proton stops making VK_NV_low_latency2 calls. This happens when d3d12_device_register_swapchain is called to register a second 100x100 dxgi_vk_swap_chain, which is immediately removed and never presented to. No VkSwapchain is created for it. Registering this second swapchain causes vkd3d-proton to discard its low_latency_swapchain and stop making VK_NV_low_latency2 calls. These calls are necessary for Reflex to work properly.
I believe this is done because the Reflex APIs don't support multiple swapchains. This is unnecessary here, because the second swapchain is not used and no second VkSwapchain is created. I will look into a fix deferring the multi-swapchain Reflex disablement until a second swapchain is presented to.
I've attached a trimmed log file showing the issue: steam-1808500-trimmed.log
Thanks for investigating this! I am sorry, I also opened an issue on dxvk-nvapi and forgot to mention it here. https://github.com/jp7677/dxvk-nvapi/issues/336
It's mostly about the stuttering part, which as it turns out also relates to reflex so I had to turn off both framegen and reflex by disabling streamline.
Probably a driver issue though, GTA V Enhanced for instance works fine with reflex and framegen off, but either on (and especially framegen) the stuttering is horrible. A bit of a different display of the issue, but still related to these two.
Weirdly, I'm playing Arc Raiders on Nvidia 5080, latest 590 drivers, latest Proton CachyOS, Framegen off, Reflex on, and the game is incredibly smooth for hours with around 120-140 fps. I know it's not helpful much, but that's just a data point I suppose.
I will voice the same here.
With DLSS on, the game starts to stutter after couple minutes and FPS drops to half. I had the same issue in Bazzite with 580 beta drivers (which was baked in to their immutable version in december 2025).
What is weird that I could swear that this issue was gone in Cachyos week ago but I don't know what has been updated in the between.
@SirRahikkala Try with Proton Experimental's 'Bleeding Edge' beta. A fix for that has been merged: https://github.com/HansKristian-Work/vkd3d-proton/pull/2804.
proton experimentalx2 2026-01DXVK_NVAPI_GPU_ARCH=GA100x1 2026-01
ARC Raiders stutters a lot if frame generation is available in game and is set to off. If I turn frame gen on, stutters disappear. They also disappear if I add DXVK_NVAPI_GPU_ARCH=GA100 variable to disable the setting. Still getting big stutters occasionally but I am not sure what they are related to, seem to happen with NVAPI off too but maybe less frequently, hard to test because the game hangs without NVAPI.
With framegen on game doesn't work great though, drops fps badly permanently in a few minutes and feels stuttery. Haven't really tried frame gen on Linux though, maybe it's a common issue with it generally?
Update: gamescope resolves framegen issue, but not the stuttering.
Log file is too big to upload, it didn't seem any different with framegen on or off, but maybe I missed something. Let me know what to look for or what to debug if it's needed.
System information