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After paving over an install of Windows 10 on a Thinkpad T495 with Ubuntu 19.10, the total RAM memory shown in my system, which was 16 GB under Windows, is now showing only as 13.6 GB under Ubuntu.

Looking for any insight as to what is going on that would cause this discrepancy.

The command cat /proc/meminfo|grep -i memtotal shows MemTotal: 14272168 kB, which is 13.6 GB.

T.J.L.
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RogerV
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  • Please click [edit] then add into your question 1) exactly which command with exactly which parameters you used to check on memory, and 2) the result of that command. Please don't use Add Comment as it throws away the formatting. – K7AAY Feb 10 '20 at 22:42
  • Show me free -h. And does the AMD integrated graphics card use shared memory? – heynnema Feb 11 '20 at 01:35
  • Okay, ran it:

    $ free -h total used free shared buff/cache available Mem: 13Gi 1.8Gi 10Gi 134Mi 1.3Gi 11Gi Swap: 975Mi 0B 975Mi

     – RogerV Feb 11 '20 at 01:48
  • When I boot into system bios setup it shows 16GB of RAM but under display it shows it using 2GB

    So integrated graphics of the AMD looks to be sharing some of the system RAM

    Also, I did take snapshots of various screens of the laptop booted up under Windows 10, I went back and reviewed those and low and behold I saw this:

    Installed RAM: 16.0 GB (13.9 GB usable)

    So Windows 10 was leaving 13.9 GB as usable whereas Ubuntu 19.10 is reporting 13.6 GB as usable. Almost a wash.

    Will leave the item open for now in case anyone can share more light on the architecture going on here.

     – RogerV Feb 11 '20 at 02:41

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