I just switched to the Gnome desktop, I have two video cards in my computer. One is intel and the other is nvidia. The closed source driver for my nvidia card does not work with wayland, so I use the open source driver. When I start a program from the terminal by typing DRI_PRIME=1 in front of it, it works with the external video card, but I want that application to work with the external video card by default. Following the instructions on the Manjaro wiki, I copied the /usr/share/application/firefox.desktop file to /home/$username/.local/share/applications/ and went in and changed Exec=/usr/lib/firefox/firefox %u to Exec=DRI_PRIME=1 /usr/lib/firefox/firefox %u. But firefox does not start with the external video card. I did the same in the original file but it doesn’t start with the external video card. How can I set firefox to work with external video card when I click on it?
Sorry for my bad English 
There are several mistakes in here - which may or may not be typos.
usr/share/application/firefox.desktop should be
/usr/share/applications/firefox.desktop
but more importantly:
/local/share/application/ … doesn’t exist
What you mean is likely:
/home/$username/.local/share/applications/
(the “hidden” directory ~/.local in your $HOME)
Thanks I’ve edited the post now.Any idea how I can start firefox with an external card?
No idea.
Like you, I would have expected it to work.
Neither do I run Gnome, nor do I have two graphics cards to choose from.
I cannot test anything I might come up with and thus cannot help you.
Not quite right.
Do it like so:
Exec=/usr/bin/sh -c "DRI_PRIME=1 /usr/lib/firefox/firefox --private-window %u"
(etc, for all the exec lines)
Notice we call the shell to quote our environment variables and execution string.
Though … I’m not sure I would want to launch FF with the dGPU … and if I did want that with an nvidia … I would probably not launch firefox using wayland.
Also note … there are numerous other env vars for FF depending on what you are doing.
This should be used if you are trying to launch firefox with wayland:
MOZ_ENABLE_WAYLAND=1
This can help with hardware acceleration … but you need the correct device path:
MOZ_DRM_DEVICE=/dev/dri/card0
Exec=/usr/bin/sh -c "DRI_PRIME=1 /usr/lib/firefox/firefox --private-window %u"
It worked when I rebooted.Thanks
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