KDE openGL compositor with nvidia drivers crashes Kwin

[Shadow_Fury]

can anyone help me get the kde compositor openGL mode working with the nvidia drivers.

it works fine with xrender, but that doesn't support blur effects, which makes transparent windows difficult to use.

i have verified that openGL is working with glxinfo.

when trying to switch to openGL, Kwin crashes

any help is appreciated

edit: here is the crash dump from Kwin

[Sheridan2021]

For me, too, the problem is that kde-frameworks was updated in the stable branch, kde-plasma remained 5.20.5, so the kwin_x11 composer remained old, the conflict between kde-frameworks and kwin_x11 5.20.5, this problem is not in the test branch.

[skiwarz]

I know this doesn't help, but OpenGL works for me, and I'm using the nvidia drivers.
I'm on stable
mesa-21.0.3
kde-frameworks/plasma-5.80.0
plasma-meta-5.20.5
kwin-5.20.5-r1
And I have OpenGL 3.1 selected in the kde settings.

I do vaguely recall having this problem a couple years ago. Make sure you've read through https://wiki.gentoo.org/wiki/NVIDIA/nvidia-drivers

[Fitzcarraldo]

Shadow_Fury,

Does your machine only have an NVIDIA GPU, or does it have NVIDIA Optimus hardware? What model is it?

Perhaps a specific Desktop Effect is causing the problem. What happens if you disable all Desktop Effects and then switch the rendering backend to OpenGL 2.0?

What happens if you disable all Desktop Effects and then switch the rendering backend to OpenGL 3.1?

What is the output of the command 'glxinfo | grep render'?

Are there any error messages in /var/log/Xorg.0.log and/or /var/log/messages?

Also, in case it helps, the installation on my machine (which has Optimus hardware) is listed below for you to compare with the output on yours:

[Shadow_Fury]

Fitzcarraldo,

It only has an NVIDIA GPU, no others. the card is an RTX 2080 TI.

turning off kvantum entirely, and setting to any openGL backends crashes kwin

glxinfo | grep render:

[Fitzcarraldo]

Are all the enabled and disabled USE flags the same as mine too?

You could try changing the theme back to Breeze. I seem to recall reading in the past that some themes can cause problems in some installations.
_________________
Clevo W230SS: amd64, VIDEO_CARDS="intel modesetting nvidia".
Compal NBLB2: ~amd64, xf86-video-ati. Dual boot Win 7 Pro 64-bit.
OpenRC udev elogind & KDE on both.
Fitzcarraldo's blog

[Shadow_Fury]

Fitzcarraldo,
some of the use flags are different, they are listed below (note: selinux is set as permissive, so it isn't actively blocking anything)
syntax: +<package that exists on mine but not yours> -<package that exists on yours but not mine>

[Fitzcarraldo]

Nothing stands out to me as problematic in your USE flags. I notice we are using different versions of x11-drivers/nvidia-drivers. I don't know how well the version you are using works with Plasma, KWin and OpenGL; hopefully someone using the same GPU as you with KWin will comment in this thread.

If only to rule it out as a factor, did you try setting the theme back to Breeze in all the following?:

System Settings > Appearance > Global Theme
System Settings > Appearance > Plasma Style
System Settings > Appearance > Application Style > Application Style
System Settings > Appearance > Application Style > Window Decorations
System Settings > Appearance > Application Style > Application Style > Configure GNOME/GTK Application Style...

Also, are there any pointers on the ADDITIONAL INFORMATION tab and the README link on the following NVIDIA page for your driver?: https://www.nvidia.com/Download/driverResults.aspx/175539/en-us

You could post a request for help in the KDE Community Forums and/or NVIDIA's forums.
_________________
Clevo W230SS: amd64, VIDEO_CARDS="intel modesetting nvidia".
Compal NBLB2: ~amd64, xf86-video-ati. Dual boot Win 7 Pro 64-bit.
OpenRC udev elogind & KDE on both.
Fitzcarraldo's blog

[Fitzcarraldo]

Just in case it helps in your case, this is what I use, but in my case KWin only crashes at login and I can re-enable compositing with OpenGL:

[Hu]