Random pixels appear on the screen in kde plasma and firefox

Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
Following CPUs are offline:
4-7
cpupower set operation was not performed on them

Sorry, I don’t know much about this subject, but when I write the ‘cpupower frequency-info’ code, it says that it is in performance mode, is there a problem?

analyzing CPU 1:
  driver: intel_cpufreq
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 20.0 us
  hardware limits: 1.20 GHz - 3.10 GHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 1.20 GHz and 3.10 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 2.25 GHz (asserted by call to kernel)
  boost state support:
    Supported: yes
    Active: yes
    25500 MHz max turbo 4 active cores
    25500 MHz max turbo 3 active cores
    25500 MHz max turbo 2 active cores
    25500 MHz max turbo 1 active cores

https://github.com/korvahannu/arch-nvidia-drivers-installation-guide I reinstalled my video card driver according to the instructions in this link and switched to the external video card with envycontrol. The problem was solved.Thanks to everyone.

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