KDE Wayland session uses llvmpipe for OpenGL, not hardware acceleration

[kliu128]

Issue description

Running a wayland session with export $(dbus-launch); startplasmacompositor on a tty, everything seems to work, but OpenGL applications are quite slow. Running glxinfo reveals that they are using llvmpipe. (This might just be an XWayland thing, but I'm not sure.) Firefox (on XWayland) also says it is using llvmpipe.

I have an AMD GPU and have the following opengl-related options enabled:

services.xserver.enable = true;
services.xserver.videoDrivers = [ "amdgpu" ];                                                        
hardware.opengl.driSupport32Bit = true;

Steps to reproduce

1. Start KDE with export $(dbus-launch); startplasmacompositor.
2. Run glxinfo in a terminal to see that it is using llvmpipe.

Technical details

• System: 18.03pre118265.df528e4472 (Impala)
• Nix version: nix-env (Nix) 1.11.15
• Nixpkgs version: 18.03pre118265.df528e4472
• Sandboxing enabled: false

[ghost]

Running glxinfo reveals that they are using llvmpipe. (This might just be an XWayland thing, but I'm not sure.)

It is XWayland thing. Should be fixed by https://github.com/NixOS/nixpkgs/pull/30828

To test what KDE itself uses, do the following: "open KRunner, enter “KWin”, select KWin Debug Console, switch to OpenGL tab"

[kliu128]

KWin is using OpenGL with the proper hardware rendering.

30828 does indeed fix it; XWayland's glxinfo now reports the proper render info:

...
Extended renderer info (GLX_MESA_query_renderer):                                                                            
    Vendor: X.Org (0x1002)                                                                                                   
    Device: Radeon RX 580 Series (AMD POLARIS10 / DRM 3.18.0 / 4.13.9, LLVM 5.0.0) (0x67df)                                  
    Version: 17.2.2                                                                                                          
    Accelerated: yes                                                                                                         
    Video memory: 8050MB
...

Thank you very much!

[kliu128]

Fixed by now-merged #30828.