[Intel-gfx] Intel Driver and 4K video output

[Lukas Hejtmanek]

On Thu, Apr 23, 2015 at 11:19:50AM +0100, Chris Wilson wrote:
> I probably have the scaling inverted. What should also work, but we may
> have to beat the kernel up to fix a few bugs...
> 
> xrandr --addmode eDP1 3840x2160 \
> 	--output eDP1 --primary --mode 3840x2160 --crtc 0 \
> 	--output DP1-9 --preferred --position 0x0 -crtc 1 \
> 	--output DP1-8 --preferred --position 1920x0 -crtc 1 \
> 
> That way we should be able to use the panel fitter for hardware
> downscaling. But there are all sorts of bandwidth caveats that I may have
> violated, as well as the code being untested! However, the mouse will be
> the wrong size. :|

well, this one does not work, but I found this command working like a charm:
xrandr --output eDP1 --panning 3840x2160
xrandr --output DP1-9 --preferred --pos 0x0 --crtc 1 --output DP1-8
--preferred --pos 1920x0 --crtc 2

than I have one big screen as desired and window manager is completely happy
with it, i.e., window maximizing really maximizes the window to 3840x2160. So
really happy with it.

Maybe, one day someone proposes a window manager that rearrange windows on
resolution change ;)

-- 
Lukáš Hejtmánek