Attached is a spreadsheet with the above data and some graphs. The first graph compares normalized data from the ACPI thermal zones (acpiz), CPU freq and CPU utilization. This shows a good correlation on CPU utilization and temperature (as we would expect). CPU frequencies are scaling according to the load and looks OK to me.
The second graph is a comparison of ACPI thermal zones and CPU utilization in absolute terms (e.g. degrees C and CPU %). Note that the CPU is loaded never less than 20% and that at this level the temperature seems to be levelling out to around 70 degrees C which seems rather high. The CPU is bouncing around 800Mhz - 1.8GHz at that point, which I guess is to be expected if one has so many context switches and IRQs occurring. So. Some interesting data: 1. The IRQ rate does seem high. 2. The Context switch rate seems high too. 3. The machine is not that idle. 4. Even at a low-ish load, the system is rather hot. (This makes me wonder if there is something physically wrong between the CPU and the heatpipe/fan unit.) 5. Dropping from fully loaded to partially loaded we see heat being dissipated but not that well, e.g. it drops from nearly 100 C down to 70-65 C, which is surprising and I expected this to go lower. Hence I think it may be a physical hardware issue with the cooling. ** Attachment added: "LibreOffice spreadsheet" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1491797/+attachment/4456965/+files/powerstat-lenovo-W500-2015.09.03.ods -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1491797 Title: Shuts down when supposed to suspend as a reaction to self-caused overheat, session lost To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1491797/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
