Total RAM not available

[Aravisian]

@ddelmege

[ 0.136276] Memory: 6793776K/7133300K available (22221K kernel code, 4652K rwdata, 16296K rodata, 5264K init, 4212K bss, 326184K reserved, 0K cma-reserved)

Your total RAM is never all available on any operating system. Some must be reserved for critical system components , so this kind of message is normal.

@ddelmege

[ 0.071298] DMAR: [Firmware Bug]: No firmware reserved region can cover this RMRR [0x0000000079800000-0x000000007bffffff], contact BIOS vendor for fixes

Now - the missing ten gigs...
When you put in the new RAM sticks, are there only Two Slots?
If more than Two, did you leave an empty slot between them (If not, you should).

Try using the Grub parameter intel_iommu=off to bypass this firmware bug. Sadly, if your BIOS is fully up to date, you cannot update the BIOS Firmware to resolve this... so disabling IOMMU becomes your workaround.

[HOW TO] add a grub parameter

There may be times that a user must add a specialized grub parameter in order to overcome an issue. The purpose of this guide is not to provide parameters, as that would be a case by case basis. It is to provide a guide on how to add one. To add a parameter, in a terminal (TTY, Recovery Prompt or Terminal Emulator) run: sudo nano /etc/default/grub Arrow key down to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and place your parameter within the quotation tags. For example if you are adding th…

Note that you are using intel_iommu=off and not nomodeset.