Thanks for the hint. I did that today and after a few minutes of video streaming (www.tagesschau.de) "top" showed me the now well-known "kidle_inject" processes but the box held out for a bit over ten minutes, which is more but not significantly more than before. Then it switched off. I booted the 3.16 kernel, reloaded the same video stream (it is available for two hours), and it played the full 15 minutes without any kidle_injects appearing. And without powering off the machine, of course.
This time "top" (under 3.19) never showed me any processes (firefox, plugin-container) going anywhere near 100% of CPU load; everything remained under 50% most of the time, more or less as with the old kernel. And still those kidle_inject processes come up. Could it be a false alarm (despite the very warm air coming from the fan slots)? I know that kidle_inject generates no CPU load, just blocks other processes from taking a CPU. Could it still have influence on the temperature sensor and the fan? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1452421 Title: ubuntu 15.04 overheats Status in linux package in Ubuntu: Incomplete Bug description: On 2015-04-26 I upgraded to Ubuntu 15.04 (from 14.10). Since then, my notebook (HP envy dv6) fan is nearly always on, and the notebook switched off several times, probably due to overheating. Each time I was working with Firefox; watching the "livestream" of www.tagesschau.de seems to be a good way of reproducing the problem. Going back to the 3.16.0-31 kernel (still offered by grub) seems to circumvent the problem. When I boot 3.16 the fan runs only occasionally. My first 15.04 kernel was 3.19.0-15, today I got -16 but the problem is the same. Before the machine switches off (it does not shut down Linux but just goes out) "top" shows me eight instances of "kidle_inject", obviously desperately but hopelessly trying to keep processor load down. Under the 3.19 kernel the "plugin-container" process goes to loads of more than 100 % (on a four-core box), under 3.16 it never goes beyond 60 %. Note that between the "overheat" and the "normal" scenario I change only the kernel in the boot menu, all other binaries are the same (15.04). Especially, it's the same firefox. I fear that within a couple of weeks more kernel versions will arrive at my system and eventually push the working 3.16 kernel out of my grub menu, and then I shall have no way left of running my system for more than 20 or 30 minutes. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: kernel-common (not installed) ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8 Uname: Linux 3.16.0-34-generic x86_64 ApportVersion: 2.17.2-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Wed May 6 20:57:39 2015 InstallationDate: Installed on 2014-06-09 (331 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) SourcePackage: kernel-package UpgradeStatus: Upgraded to vivid on 2015-04-24 (12 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1452421/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
