High CPU load while Video watching

[RandoRandy]

Hey,
since today my laptop sits at 70% all core load while watching videos or in zoom conference calls. Something between 20% and 50% comes from the cinnamon task. Any help is appreciated!
I have a Lenovo Flex 5 14 amd with a Ryzen 5 4700u.
inxi -Fxz:

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System:
  Kernel: 5.8.0-50-generic x86_64 bits: 64 compiler: N/A 
  Desktop: Cinnamon 4.8.6 Distro: Linux Mint 20.1 Ulyssa 
  base: Ubuntu 20.04 focal 
Machine:
  Type: Convertible System: LENOVO product: 81X2 v: IdeaPad Flex 5 14ARE05 
  serial: <filter> 
  Mobo: LENOVO model: LNVNB161216 v: SDK0J40709 WIN serial: <filter> 
  UEFI: LENOVO v: EECN31WW date: 12/18/2020 
Battery:
  ID-1: BAT0 charge: 52.6 Wh condition: 53.0/52.5 Wh (101%) 
  model: LGC L19L3PD6 status: Unknown 
CPU:
  Topology: 8-Core model: AMD Ryzen 7 4700U with Radeon Graphics bits: 64 
  type: MCP arch: Zen rev: 1 L2 cache: 4096 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 31937 
  Speed: 2335 MHz min/max: 1400/2000 MHz Core speeds (MHz): 1: 1905 2: 2101 
  3: 2400 4: 1815 5: 2084 6: 2339 7: 2573 8: 2164 
Graphics:
  Device-1: AMD Renoir vendor: Lenovo driver: amdgpu v: kernel 
  bus ID: 04:00.0 
  Display: x11 server: X.Org 1.20.9 driver: amdgpu,ati 
  unloaded: fbdev,modesetting,vesa resolution: 1920x1080~60Hz 
  OpenGL: renderer: llvmpipe (LLVM 10.0.1 256 bits) v: 3.3 Mesa 20.1.6 
  direct render: Yes 
Audio:
  Device-1: AMD driver: snd_hda_intel v: kernel bus ID: 04:00.1 
  Device-2: AMD Raven/Raven2/FireFlight/Renoir Audio Processor 
  vendor: Lenovo driver: N/A bus ID: 04:00.5 
  Device-3: AMD Family 17h HD Audio vendor: Lenovo driver: snd_hda_intel 
  v: kernel bus ID: 04:00.6 
  Sound Server: ALSA v: k5.8.0-50-generic 
Network:
  Device-1: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel bus ID: 02:00.0 
  IF: wlp2s0 state: up mac: <filter> 
  IF-ID-1: docker0 state: down mac: <filter> 
Drives:
  Local Storage: total: 476.94 GiB used: 53.88 GiB (11.3%) 
  ID-1: /dev/nvme0n1 vendor: SK Hynix model: HFS512GD9TNI-L2A0B 
  size: 476.94 GiB 
Partition:
  ID-1: / size: 101.29 GiB used: 53.85 GiB (53.2%) fs: ext4 
  dev: /dev/nvme0n1p5 
Sensors:
  System Temperatures: cpu: 71.1 C mobo: 56.0 C gpu: amdgpu temp: 55 C 
  Fan Speeds (RPM): N/A 
Info:
  Processes: 299 Uptime: 1h 28m Memory: 15.08 GiB used: 2.43 GiB (16.1%) 
  Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17 
  inxi: 3.0.38 

Thank you all in advance

[mikeflan]

Welcome to the forum. Your computer is quite beefy and is a little faster than mine.
I am on LM19.3 Cinnamon.
Please run System Monitor, run a video, and take a screen shot of System Monitor (Alt - Prnt Scrn).
I had a live stream going and then started another YT video at the same time and mine looks like this:

[RandoRandy]

Here you go. The little dip at the end are the few seconds between stopping the video, switching to System Monitor and taking the screenshot.

[mikeflan]

Well I'll be. That is unexpected. If it is not causing any trouble I would tend to ignore it, but watch it closely. I also wonder if the edge kernel is available to you. I don't know hardly anything about it, but you can give it a try if it is in Update Manager - View - Linux Kernels. Even the 5.8 kernel is not listed on my LM 19.3.

[RandoRandy]

So, could it be some update screwing up? I don't remember exactly when it happend, but here is my update history from around the time, either on the 11th or the 12th it must have happend, do you have any idea wich one it could have been?

And just now, my Cinnamon was cruising at a toasty 40-45% with the screenshot tool open, so it must be some sort of a graphics related issue?

I don't know...

Thanks for your time and help anyways!

[mikeflan]

I don't have a clue. I have never had to do this, but I keep recommending it for others.
Timeshift back. Add updates slowly over time with other snapshots taken until it breaks again.
Back up one snapshot and tell us which one broke it.

[RandoRandy]

Well...
I'm quite new to Linux and I installed Linux for uni related stuff and I haven't gotten around the whole snapshot and backup stuff, so the best I can do, is to manually install the older versions of the packages... Or I wait for the next update, that fixes it, right now I'm quite stressed with uni, so probably the latter...

But thanks for the help anyways and I'll report back here, when I get it fixed somehow.

[mikeflan]

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I haven't gotten around the whole snapshot and backup stuff

If you have the disk space Timeshift can save you many man-weeks worth of work in just a couple of minutes. I haven't reverted back to a snapshot in probably more than 2 months now, but it sure is handy to have when needed.