I installed Linux on my Lenovo Yoga 500 with 8GB RAM near my Windows. Windows works correctly and sees 8GB of RAM. But Linux installed on the notebook only sees 2GB RAM (1,8).
The command in the terminal: free -m also shows 1,8GB of RAM, but on sudo lshw -class memory I see my RAM stick with 8GB. memtest also sees 1,8GB of RAM.
I have this problem on installed Linux and on live versions (Ubuntu, Mint, Kali) from USB stick storage.
All of them are 64bit versions.
I also tried add mem=8G to the grub file, but nothing changed.
EDIT 1:
free -m result:
total used free shared buff/cache available
Mem: 1868 1147 79 236 641 435
Swap: 0 0 0
sudo lshw -class memory result: https://pastebin.com/1iSHbR8J
sudo dmidecode -t memory result: https://pastebin.com/kaMxnAXc
cat /proc/meminfo result: https://pastebin.com/RMTbcuU8
