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My Dell starts heating up on the marked spot (see photo below) immediately after booting any Linux distro I tried (Ubuntu 16.04, Ubuntu 14.04, Mint 18.2, Arch). This spot is cool on Windows. Also, the other site (bottom) is cold. I don't know what device is below neither why it happens. I checked with sensors (lm-sensors) and all is below 45°C, but obviously the part here has no sensor.

Dell Latitude E5570 (128 SSD, intel i5, integrated graphics, 8 Gb RAM)

There is no HDD in this laptop. Also, this spot is hot when runnig USB live.

I contacted Dell support and was informed that it is palm rest assemby that heats up. Any idea on how to fix it?

  • It seems to be the HDD, see the manual page 12. How to lower the HDD temperature might help you. – dessert Aug 21 '17 at 6:49
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    There is no HDD. Only SSD. – sawic Aug 21 '17 at 6:56
  • There is no palm rest "assembly" either. The palms rest on the enclosure, that's the palm rest, just plastic. What matter is what's inside right below that spot. I suggest you turn it upside down and check what's there. I suspect you'll find a removable cover and the SSD inside. SSDs do heat a lot sometimes. – user692175 Aug 21 '17 at 10:33
  • Could you post the output of sensors anyway? – Andrea Lazzarotto Aug 21 '17 at 11:07
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By default, Linux writes to the disk every time a read operation is carried out.

You could try disabling atime and diratime on the mounted disk to see if it helps.

Open /etc/fstab and find the mountpoint and add "noatime" and "nodiratime" to the row.

The row usually looks something like:

UUID=DriveIDStringHere /               ext4    errors=remount-ro,noatime,nodiratime 0      1

Disabling this might also prolong the longevity of your SSD.

  • But when booting USB live, this should not be a problem. Right? – sawic Aug 21 '17 at 7:43
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    @sawic Not necessarily. If the SSD has a swap partition the live session will use it. – user692175 Aug 21 '17 at 10:34
  • “every time a read operation is carried out” Doesn't Ubuntu use relatime by default? – Andrea Lazzarotto Aug 25 '17 at 13:37

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