I have the same heating issue after a clean install of Ubuntu 18.04. Before that I was using Ubuntu 16.04, without this problem.
Fans are more active than before and the laptop is constantly overheated, with 70-80 degrees doing nothing but only Chrome or even with the shell opened. Nvidia drivers has been removed (I can live with the integrated Intel). Kworker issue (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793) already fixed. This happens on a Samsung 7 Chronos NP700Z7C (CPU i7 3rd gen) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1768976 Title: Ubuntu 18.04 is overheating after upgrade from 16.04 Status in ubuntu-release-upgrader package in Ubuntu: New Status in xserver-xorg-video-nouveau package in Ubuntu: New Bug description: Ubuntu is overheating at my laptop. Opening youtube on firefox is enough for critical temperature shutdown. Using lm-sensors for monitoring on 18.04 the temp varies between 70 and 85°C with only firefox or chrome open and doing nothing. On my old 16.04 with same using, the temp varies between 55 and 70°C. First thought was the driver nouveau is the problem, and finally I was able to install by add "nouveau.modeset=0" at livecd boot options, without temp shutdown. After install I disable the nouveau at modprobe blacklist, but the system continues overheating and shutdown with basic usage. I have no idea what's happening with the bionic at my laptop. My laptop is a Samsung RF411 i5 2nd Generation and Geforce 540M. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.17 ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CrashDB: ubuntu CurrentDesktop: ubuntu:GNOME Date: Thu May 3 16:22:40 2018 InstallationDate: Installed on 2018-04-27 (6 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) PackageArchitecture: all SourcePackage: ubuntu-release-upgrader Symptom: dist-upgrade UpgradeStatus: No upgrade log present (probably fresh install) VarLogDistupgradeAptHistorylog: Start-Date: 2018-04-27 15:46:02 End-Date: 2018-04-27 15:46:02 VarLogDistupgradeAptlog: Log time: 2018-04-27 15:45:39.753331 Starting pkgProblemResolver with broken count: 0 Starting 2 pkgProblemResolver with broken count: 0 Done Log time: 2018-04-27 15:46:04.859979 VarLogDistupgradeApttermlog: Log started: 2018-04-27 15:46:02 Log ended: 2018-04-27 15:46:02 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1768976/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp