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I have recently asked another question here regarding problems with running steam games in a nested X session with Xephyr. I think now that I have narrowed down the problem to the X server not having DRI enabled.

The command

xdpyinfo | grep DRI

does not show anything.

In my main display, it shows both DRI 2 and DRI 3.

On the other hand, glxinfo shows:

name of display: :1
display: :1 screen: 0  
direct rendering: Yes

I'm using a RX480 gpu with i7 3770k cpu on an Ubuntu 20.04 clean install.

My xorg.conf is:

10-amdgpu.conf
Section "OutputClass"
    Identifier "AMDgpu"
    MatchDriver "amdgpu"
    Driver "amdgpu"
    Option "DRI" "3"
EndSection
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  • I guess that Xephyr doesn't support DRI and it's somehow related to the fact that Xephyr doesn't have GLX support.
    – int_ua
    Commented May 4, 2020 at 20:50
  • I couldn't make it run... Turned out I could run the game through a web browser and that worked for the session, but now I have another problem. If you would kindly see if you can help me with this issue as well: askubuntu.com/questions/1235762/… thank you for all answers.
    – Matheus Cardoso
    Commented May 5, 2020 at 17:09

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