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NUC5i5RYB intermittent video output and overheating


I have a NUC NUC5i5RYB with firmware version RYBDWi35.86A.0354.2016.0120.0912 (Release Date: 01/20/2016, BIOS Revision: 5.6) running Gentoo Linux. The NUC boots up fine and the display comes up. However, after running for a few minutes the screen starts to flicker and it then blanks out the screen.

The sensors package reports the following in idle conditions:

# sensors


Adapter: Virtual device

temp1: +27.8°C (crit = +110.0°C)

temp2: +29.8°C (crit = +110.0°C)


Adapter: ISA adapter

Physical id 0: +100.0°C (high = +105.0°C, crit = +105.0°C)

Core 0: +99.0°C (high = +105.0°C, crit = +105.0°C)

Core 1: +100.0°C (high = +105.0°C, crit = +105.0°C)


Adapter: ISA adapter

Vcore: +1.81 V (min = +0.00 V, max = +1.74 V) ALARM

in1: +1.35 V (min = +0.00 V, max = +0.00 V) ALARM

AVCC: +3.31 V (min = +2.98 V, max = +3.63 V)

+3.3V: +3.31 V (min = +2.98 V, max = +3.63 V)

in4: +1.00 V (min = +0.00 V, max = +0.00 V) ALARM

in5: +0.00 V (min = +0.00 V, max = +0.00 V)

in6: +0.12 V (min = +0.00 V, max = +0.00 V) ALARM

3VSB: +3.30 V (min = +2.98 V, max = +3.63 V)

Vbat: +3.23 V (min = +2.70 V, max = +3.63 V)

fan1: 0 RPM (min = 0 RPM)

fan2: 8333 RPM (min = 0 RPM)

SYSTIN: +26.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor = thermistor

CPUTIN: +85.0°C (high = +80.0°C, hyst = +75.0°C) ALARM sensor = CPU diode

AUXTIN: +86.0°C (high = +80.0°C, hyst = +75.0°C) ALARM sensor = CPU diode

PCH_CHIP_CPU_MAX_TEMP: +99.0°C (high = +80.0°C, hyst = +75.0°C)

PECI Agent 0: +100.0°C (high = +80.0°C, hyst = +75.0°C)

(crit = +105.0°C)



intrusion0: OK

intrusion1: OK

beep_enable: disabled

The temperature seems high. Could this be the reason why the video is blanking out and how can i reduce the temperature?

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1 Reply
Super User Retired Employee

First of all, the RY NUC has an NCT5577D SIO, which offers only a subset of the sensors offered by the NCT6776D SIO. As a result, some of the readings that you are looking at are spurious or incorrect.

That said, yes indeed, your processor is severely overheating. This tells me that one of two things is occurring:

  • The BIOS' fan speed control programming is incorrect. I suggest that you do the following:
    • Make sure you are running on the latest available BIOS.
    • Go into BIOS Setup (Visual BIOS) and try setting the fan speed control programming as follows:


  • We know that the blower is operating properly (we have a non-zero speed). If the heatsink has separated from the processor (or TIM is insufficient), however, the blower is not going to be extracting the proper amount of heat from the processor. The only solution to this issue is to attempt to fix it. Alternatively, if you do not want to attempt this yourself and you are still within your warranty period, you could contact Intel Customer Support and request a replacement.

Hope this helps,