[Intel-gfx] No HW acceleration for HDPI scaling

[Oleg German]

Hello, I've recently tried to combine HD display with laptop HDPI display
(1920x1200 + 3200x1800)

I've tried to follow this instruction
https://wiki.archlinux.org/index.php/HiDPI#Side_display

And final script looks like this
xrandr --output DP1 --scale 2x2 --mode 1920x1200 --fb 3840x4200 --pos 0x0
xrandr --output eDP1 --scale 1x1 --pos 0x2400

Now it looks good, but everything becomes very slow like there is HW
acceleration at all.

I'm using Intel® HD Graphics 520 on Ubuntu 16.04 + latest updates via Intel
Graphics Update Tool

Can anyone suggest how to make it fast or maybe better scaling method?
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