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laptop suddenly overheating: mainline/LTS; intel sna/uxa; power-saving

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https://bbs.archlinux.org – Thanks for responding. I actually find it quite frightening as I've never had a laptop overhead to the extent that it turned off before and when it kept happening...I was checking with sensors fairly often but never caught it just before it shut itself off. I was seeing temperatures in the high 60s/low 70s. The RPM for the fan seemed to be adjusting itself reasonably normally and I could feel the hot air being blown out so it was definitely working. Those temps are high even in comparison with my normal results on recent (3.6*) kernels.  cpu scaling seemed reasonably normal. (Mix of (HowTos)