[Bug 286480] x11/kde: No compositing nor desktop effects anymore after upgrading from qt5 to qt6 with old NVidia graphics card

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286480

Jason E. Hale <jhale at FreeBSD.org> changed:

           What    |Removed                     |Added
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              Flags|maintainer-feedback?(kde at Fr |maintainer-feedback+
                   |eeBSD.org)                  |
                 CC|                            |jhale at FreeBSD.org
             Status|New                         |Open

--- Comment #3 from Jason E. Hale <jhale at FreeBSD.org> ---
I had a similar issue on my 7 year old laptop running -CURRENT where kwin
compositing features were not working, or even showing up in System Settings
after updating to plasma6. My high-performance GPU, a GTX 1060, is miraculously
still supported by the latest NVidia drivers, however, and I also use
graphics/nvidia-drm-kmod since I have a hybrid Intel/NVidia GPU situation going
on, so not sure how much of this will help.

Since you're using -STABLE, like with -CURRENT, make sure you have
rebuilt/reinstalled *all* of your kernel modules from ports against your
installed kernel. I really don't trust pre-built packages for this, even with
recent efforts to improve the situation.

I also had to add the following to /boot/loader.conf and do a reboot:
hw.nvidiadrm.modeset="1"

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