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The original was posted on /r/steamdeck by /u/mc711 on 2025-09-15 14:30:35+00:00.
this is a common question and I spent some time trying to figure out how to get this working properly. so thought i'd share. this guide assumes you have decky-lsfg-vk installed and working properly, and this is just how to get it working with flatpaks.
requirements:
- Lossless Scaling (https://store.steampowered.com/app/993090/Lossless_Scaling/)
- decky-lsfg-vk (https://github.com/xXJSONDeruloXx/decky-lsfg-vk)
- Flatseal (Get on Discover Store)
Install lsfg-vk flatpak:
- Download the two flatpak files
https://github.com/PancakeTAS/lsfg-vk/releases 2. Go to where you downloaded the two files, right-click and select "Open Terminal Here" 3. Paste these commands to install the files
flatpak install ./org.freedesktop.Platform.VulkanLayer.lsfg_vk_23.08.flatpak
flatpak install ./org.freedesktop.Platform.VulkanLayer.lsfg_vk_24.08.flatpak
it will ask you for your root password to install 4. Open Flatseal,
NOTE: you can decide whether to make this universal, or do it by app. i recommend you just do it for all, since this won't trigger unless you add the command
Select "All Applications" on the left, and scroll down to "Filesystem" on the right
Click the plus next to "Other Files" and add these 3 lines (click the + for every line)
/home/deck/.local/share/Steam/steamapps/common/Lossless Scaling/Lossless.dll
/home/deck/.config/lsfg-vk/:rw
/home/deck/lsfg:rw
Scroll down more to "Environment" and click the plus and add
LSFG_CONFIG=/home/deck/.config/lsfg-vk/conf.toml
If you prefer to do it per-app, instead of selecting "All Applications" do the steps for your desired app only. 5. Add the flatpak to Steam (if you already added skip this step) 6. In Steam, right-click your flatpak shortcut and click "Properties" 7. IMPORTANT: IN TARGET (NOT LAUNCH OPTIONS) put the decky-lsfg-vk command
~/lsfg
if it doesn't work, you can also try
/home/deck/lsfg
so it will look like this
~/lsfg "usr/bin/flatpak"
- And there you go, decky-lsfg-vk should be working.
edit: i forgot to change the generic path, fixed now