Dear Maintainer,

My box (using a RTX 3060 Ti GPU) has been working flawlessly under
bookworm with the non-free drivers from nvidia.  After upgrading to
trixie, I noticed that after locking my XFCE desktop session (thus
using xflock4), unlocking works, but subsequently the screen remains
black (the mouse pointer is still visible).  I had to restart the
desktop session from a text console.

Here is a report of the same issue by someone else:
https://forum.xfce.org/viewtopic.php?id=18734

In order to work around the problem, I purged all nvidia driver
version 550 related packages and reinstalled nvidia-driver and
associated packages from bookworm (535.247.01-1~deb12u1).  This made
the problem disappear, thus I believe that it is indeed related to the
nvidia driver. (Alternatively it could be that xflock4 is doing
something nonstandard that works with the older driver version, but
doesn't with the new one, but this seems unlikely.)

Thanks
Christoph