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Edit: I misunderstood. 100% core use all the time for no reason isn’t normal.
My first thought would be driver or kernel bug, or a runaway parent process.
For a fuller view of resource usage, I would use either atop or htop. While debugging, you can prlimit
with the pid
flag to save battery.
Sounds like an HDR problem. To troubleshoot this issue, try uninstalling TikTok and going for a walk.