integrated graphics devices using system RAM

[Daniel Pocock <daniel@xxxxxxxxxx>]

I've observed problems on a few hosts where the integrated graphics
device (e.g. Intel Kaby Lake with HD630) has no dedicated VRAM and uses
normal system memory.

When Firefox uses up a lot of memory, really bad things happen, for
example, the screen goes blank or X restarts.

On systems with dedicated video memory (e.g. NVIDIA cards) it appears
that X keeps running when memory is tight and the user typically has a
better opportunity to close windows.

Is it possible for the kernel or Xorg to reserve a big chunk of RAM, for
example, 4GB, which will only be used for video?  Are there any command
line options, sysctls or Xorg.conf settings to help with this?

Regards,

Daniel
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