I had the exact same issue as you in Apex Legends, and I was able to find a workaround. Basically, nvidia reflex didn’t work with dx11 (DXVK) at all, but forcing the game into dx12 (VKD3D) mode worked without issue.
To enable, you just need to set this in your launch options.
command% -anticheat_settings=SettingsDX12.json
Also, you may need to set the nvapi environmental variable, but I’m pretty sure nvapi is already enabled in proton for Apex Legends.
I recommend using proton experimental as it uses an up-to-date version of dxvk-nvapi
They sorta do. Flatpak user install puts shims in
~/.local/share/flatpak/exports/bin/
. You should need to add it to your path.I’m pretty sure flatpak system installs are at
/var/lib/flatpak/exports/bin/
so you’d just add that to path.