Just quick addition to the description.. Here is a log of the processor fan RPM taken over a few seconds as the PC is idle showing what I consider to be excessive changes in the CPU fan RPM whilst the CPU temperatures are quite low and the PC is idle:
Processor Fan: 382 RPM Processor Fan: 313 RPM Processor Fan: 328 RPM Processor Fan: 350 RPM Processor Fan: 386 RPM Processor Fan: 686 RPM Processor Fan: 1201 RPM Processor Fan: 2105 RPM Processor Fan: 3035 RPM Processor Fan: 3505 RPM Processor Fan: 3383 RPM Processor Fan: 2775 RPM Processor Fan: 2266 RPM Processor Fan: 1842 RPM Processor Fan: 1531 RPM Processor Fan: 1305 RPM Processor Fan: 1118 RPM Processor Fan: 998 RPM Processor Fan: 907 RPM Processor Fan: 848 RPM Processor Fan: 762 RPM Processor Fan: 703 RPM Processor Fan: 645 RPM Processor Fan: 587 RPM Processor Fan: 530 RPM Processor Fan: 500 RPM Processor Fan: 444 RPM Processor Fan: 416 RPM Processor Fan: 368 RPM Processor Fan: 318 RPM Processor Fan: 310 RPM Processor Fan: 314 RPM Processor Fan: 356 RPM Processor Fan: 370 RPM Processor Fan: 396 RPM Processor Fan: 424 RPM Processor Fan: 514 RPM Processor Fan: 612 RPM Processor Fan: 722 RPM Processor Fan: 963 RPM Processor Fan: 1330 RPM Processor Fan: 1823 RPM Processor Fan: 2857 RPM Processor Fan: 3148 RPM Processor Fan: 3022 RPM Processor Fan: 2720 RPM Processor Fan: 2377 RPM Processor Fan: 1971 RPM Processor Fan: 1670 RPM Processor Fan: 1404 RPM Processor Fan: 734 RPM Here is the sensors output: radeon-pci-0100 Adapter: PCI adapter temp1: +57.5°C (crit = +120.0°C, hyst = +90.0°C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +31.0°C (high = +83.0°C, crit = +99.0°C) Core 1: +29.0°C (high = +83.0°C, crit = +99.0°C) Core 2: +31.0°C (high = +83.0°C, crit = +99.0°C) Core 3: +29.0°C (high = +83.0°C, crit = +99.0°C) it8721-isa-0a10 Adapter: ISA adapter in0: +0.85 V (min = +1.12 V, max = +2.28 V) ALARM in1: +3.02 V (min = +2.87 V, max = +0.66 V) ALARM in2: +2.00 V (min = +2.57 V, max = +1.45 V) ALARM +3.3V: +3.29 V (min = +4.56 V, max = +4.37 V) ALARM in4: +2.99 V (min = +2.95 V, max = +2.82 V) ALARM in5: +2.22 V (min = +2.62 V, max = +3.06 V) ALARM in6: +2.22 V (min = +2.29 V, max = +2.83 V) ALARM 3VSB: +3.34 V (min = +3.82 V, max = +4.58 V) ALARM Vbat: +3.02 V fan1: 1071 RPM (min = 13 RPM) fan2: 788 RPM (min = 46 RPM) temp1: -77.0°C (low = +55.0°C, high = -68.0°C) sensor = thermal diode temp2: -8.0°C (low = -58.0°C, high = -93.0°C) sensor = thermistor temp3: -68.0°C (low = -77.0°C, high = -49.0°C) sensor = Intel PECI intrusion0: ALARM dell_smm-virtual-0 Adapter: Virtual device Processor Fan: 1079 RPM Motherboard Fan: 794 RPM and a fraction of a second later: radeon-pci-0100 Adapter: PCI adapter temp1: +57.0°C (crit = +120.0°C, hyst = +90.0°C) coretemp-isa-0000 Adapter: ISA adapter Core 0: +29.0°C (high = +83.0°C, crit = +99.0°C) Core 1: +28.0°C (high = +83.0°C, crit = +99.0°C) Core 2: +31.0°C (high = +83.0°C, crit = +99.0°C) Core 3: +28.0°C (high = +83.0°C, crit = +99.0°C) it8721-isa-0a10 Adapter: ISA adapter in0: +0.85 V (min = +1.12 V, max = +2.28 V) ALARM in1: +3.02 V (min = +2.87 V, max = +0.66 V) ALARM in2: +2.00 V (min = +2.57 V, max = +1.45 V) ALARM +3.3V: +3.29 V (min = +4.56 V, max = +4.37 V) ALARM in4: +2.99 V (min = +2.95 V, max = +2.82 V) ALARM in5: +2.22 V (min = +2.62 V, max = +3.06 V) ALARM in6: +2.22 V (min = +2.29 V, max = +2.83 V) ALARM 3VSB: +3.34 V (min = +3.82 V, max = +4.58 V) ALARM Vbat: +3.02 V fan1: 668 RPM (min = 13 RPM) fan2: 788 RPM (min = 46 RPM) temp1: -77.0°C (low = +55.0°C, high = -68.0°C) sensor = thermal diode temp2: -8.0°C (low = -58.0°C, high = -93.0°C) sensor = thermistor temp3: -69.0°C (low = -77.0°C, high = -49.0°C) sensor = Intel PECI intrusion0: ALARM dell_smm-virtual-0 Adapter: Virtual device Processor Fan: 673 RPM Motherboard Fan: 794 RPM -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1514052 Title: erratic fan speed and little control kernel 4.2 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1514052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
