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

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1889377

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

Status in gnome-shell package in Ubuntu:
  Invalid

Bug description:
  I've read it might be an issue related to NVidia running on noveaux drivers.
  Actually this is my configuration (NVidia G92 [GeForce 9600 GSO]) with 
noveaux because if I install proprietary NVidia drivers, I cannot boot (system 
freezes on purple screen at boot before asking for login) even with all the 
proper configurations(nomodeset on grub, WaylandEnable=false in 
/etc/gdm3/custom.conf)

  1) Ubuntu release: Ubuntu 20.04.1 LTS

  2) apt-cache policy gnome-shell
  gnome-shell:
    Installed: 3.36.3-1ubuntu1~20.04.2
    Candidate: 3.36.3-1ubuntu1~20.04.2
    Version table:
   *** 3.36.3-1ubuntu1~20.04.2 500
          500 http://it.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
          100 /var/lib/dpkg/status
       3.36.1-5ubuntu1 500
          500 http://it.archive.ubuntu.com/ubuntu focal/main amd64 Packages

  3) System running quick

  4) System very slow

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.3-1ubuntu1~20.04.2
  Uname: Linux 5.7.10-050710-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.4
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Jul 29 10:31:30 2020
  DisplayManager: gdm3
  GsettingsChanges:

  InstallationDate: Installed on 2020-07-16 (12 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  RelatedPackageVersions: mutter-common 3.36.3-0ubuntu0.20.04.1
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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