Workaround:

sudo -s
for g in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do
  echo performance > $g
done

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https://bugs.launchpad.net/bugs/1897853

Title:
  [regression] gnome-shell stutters noticeably with kernel 5.8.0-19, but
  not 5.8.0-18

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  gnome-shell stutters noticeably with kernel 5.8.0-19

  I've now tested four recent kernels:

  5.8.0-20: stutters
  5.8.0-19: stutters
  5.8.0-18: smooth
  5.8.0-16: smooth

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: linux-image-5.8.0-19-generic 5.8.0-19.20
  ProcVersionSignature: Ubuntu 5.8.0-19.20-generic 5.8.8
  Uname: Linux 5.8.0-19-generic x86_64
  ApportVersion: 2.20.11-0ubuntu48
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Wed Sep 30 13:52:38 2020
  InstallationDate: Installed on 2020-07-16 (76 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200507)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 17ef:6009 Lenovo ThinkPad Keyboard with TrackPoint
   Bus 001 Device 003: ID 045e:0823 Microsoft Corp. Classic IntelliMouse
   Bus 001 Device 002: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 10M7CTO1WW
  ProcEnviron:
   LANGUAGE=en_AU:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-19-generic 
root=UUID=21e70a66-4d0f-49fc-b42c-668fc1594d91 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-5.8.0-19-generic N/A
   linux-backports-modules-5.8.0-19-generic  N/A
   linux-firmware                            1.190
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2018
  dmi.bios.release: 0.47
  dmi.bios.vendor: LENOVO
  dmi.bios.version: M16KT47A
  dmi.board.name: 3102
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN 3259627060530
  dmi.chassis.type: 3
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrM16KT47A:bd02/06/2018:br0.47:svnLENOVO:pn10M7CTO1WW:pvrThinkCentreM710s:rvnLENOVO:rn3102:rvrSDK0J40709WIN3259627060530:cvnLENOVO:ct3:cvrNone:
  dmi.product.family: ThinkCentre M710s
  dmi.product.name: 10M7CTO1WW
  dmi.product.sku: LENOVO_MT_10M7_BU_Think_FM_ThinkCentre M710s
  dmi.product.version: ThinkCentre M710s
  dmi.sys.vendor: LENOVO

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