Hi Daniel, and thanks.
Let me give you some history to explain why I had configured it like that, in 
order to understand if you could help me or router me to the proper support.

I've been using Ubuntu for around 4 years now and I've collected some 
background on my GeForce 9600 GPU and the issues that are coming with it.
I installed (freshly new) Ubuntu 20.04 around 10 days ago (after an HD failure 
without the need to restore any OS data/configuration) and I tried all I knew 
to make the GPU working:
1) installing the proprietary drivers + putting nomodeset in grub + 
uncommenting WaylandEnable=false in /etc/gdm3/custom.conf --> result: the 
system doesn't boot. It keeps staying on the purple/black screen before asking 
for login credentials

2) I restored the nouveau drivers, removed nomodeset in grub and commented back 
WaylandEnable=false in /etc/gdm3/custom.conf --> result: the system boots but 
periodically and randomly, when I do  activities like browsing with Chrome, 
maximizing a window, playing a video (the list is not exhaustive as the problem 
is not deterministic) the graphic environment freezes for very long time (also 
minutes in some case), only the mouse is moving and the system may be accessed 
without delays of performance issues via SSH; killing the process that 
presumebly originated the problem from SSH gives back control.
In logs, the error I got when this occurred was the following:
[ 3529.626679 < 2306,035088>] nouveau 0000:01:00.0: fifo: CACHE_ERROR - ch 9 
[Xorg[2370]] subc 0 mthd 0060 data beef0201
[ 3628.765241 <   99,138562>] ATL1E 0000:02:00.0 enp2s0: NIC Link is Down
[ 3629.628288 <    0,863047>] [TTM] Buffer eviction failed

3) to solve problem 2 I have put nouveau.modeset=0 in grub and it
addressed the problem (I'm not experiencing anymore that annoying
freeze) but, I learn now, originated the problem heading me to you

Do you have any idea (or can me route to the proper solving group) on
what I can do to address problem 1 or, in case not, problem 2?

Thanks again for your support.
Mirko

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https://bugs.launchpad.net/bugs/1889377

Title:
  gnome-shell using lot of CPU (costantly 30% - often up to 100%) making
  my system quite slow

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