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

[Chris Wilson]

On Fri, Apr 24, 2015 at 02:19:25PM +0200, Lukas Hejtmanek wrote:
> Chris,
> 
> On Thu, Apr 23, 2015 at 11:19:50AM +0100, Chris Wilson wrote:
> > Anything is possible... Considering that the two halves are different
> > sizes to the eDP, you can either scale the DP or scale the panel. You
> > can try something like
> 
> well, if anything is possible, can I keep virtual size 4k while display is
> turned off?
> 
> What I do is:
> xrandr --output eDP1 --panning 3840x2160
> xrandr --output DP1-9 --preferred --pos 0x0 --crtc 1 --output DP1-8
> --preferred --pos 1920x0 --crtc 2
> xrandr --output eDP1 --off
> 
> if I do not turn eDP1 off, things work pretty well. However, as soon as I turn
> eDP1 off, window manager thinks I have two separate screens 1920x2160, e.g.,
> xfce panel shrinks to a half of size.
> 
> I do all this to switch desktop to external diplay while in office. So I would
> like to have eDP1 turned off and use only the external display while being
> able to switch them on the fly using xrandr. 

iirc xrandr automatically chooses a fb size for your based on the
remaining outputs.

If you add --fb 3840x2160 to each of your invocations, it shouldn't
touch the screen size. Hopefully.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre