changes to nouveau driver in kernel 6.8.2 and higher?

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I have been trying out fedora 40 beta on a Dell XPS 15 9500 with
integrated Intel UHD graphics and discrete Nvidia graphics.
Everything worked perfectly with the 6.8.1 kernel and using nouveau 
but things started to happen after the upgrade to kernel 6.8.2 and
later 6.8.4 kernel.
First thing was an extremely slow boot, more than 3 minutes:

systemd-analyze blame
3min 18.876s sys-module-fuse.device
3min 18.817s dev-ttyS11.device
etc, etc.

Looking with journalctl -k -b shows a very long list of entries for
nouveau regularly containing the lines:

kernel: nouveau 0000:01:00.0: disp: one-time init failed, -110
kernel: nouveau 0000:01:00.0: DRM: [DRM/00000000:drmDevice] [NEW
dispc570] (ret:-110)
kernel: WARNING: CPU: 11 PID: 452 at
drivers/gpu/drm/nouveau/nvkm/subdev/gsp/r535.c:112
r535_gsp_msgq_wait+0x1a9/0x1d0 [nouveau]es:
----
kernel: nouveau 0000:01:00.0r -110: gsp: fini failed, -110
kernel: nouveau: probe of 0000:01:00.0 failed with error -110


I have not investigated if nouveau is the cause of these problems
but it in any case appears to be implicated and there are also
power management problems. Normally this laptop has a battery
rate between 9-11W but now shows a rate above 25W in small task
use.

AV
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