Aaand it's back again. Overheating. No real load. Hot as it can get.
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https://bugs.launchpad.net/bugs/1768976
Title:
Ubuntu 18.04 is overheating after upgrade
And another observation. After booting the old kernel several times..
the 4.15 kernel starts without problems also, currently it works without
the heat and performance problems. I did not change anything. I have no
idea what happened there. Weird.
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Well, the new 4.15 kernel has that problem. I still have a 4.4 kernel as
alternative, which does not have that problem. Something in between has
gone bad. This does not really narrow it down enough to know the cause,
but it's not the drivers or the hardware or other software alone.
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I want to add one more info, since most people might focus on the gpu or
drivers. The gpu temp might only indirectly show cpu temps for my
thinkpad, since they both are connected to the same heatpipe. Hot cpu =>
warm gpu. Does not mean gpu is in use.
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I want to add an observation. I upgraded from 16.04 to 18.04 and the
first boot already was sluggish and the mouse pointer is slow. First I
suspected a baloo_file process to be the cause. It's not. I noticed the
fans of my thinkpad spin up. I saw no load on the cpu (as normal user).
Also the disk i
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