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

[Chris Wilson]

On Wed, Apr 22, 2015 at 04:07:47PM +0200, Lukas Hejtmanek wrote:
> Hello,
> 
> not sure whether this list is send-patch-only or for support as well.
> 
> However, I have Lenovo X1 Carbon 3rd gen, with 2560x1440 local panel and 4k
> (3840x2160) external display connected via display port (directly on X1).
> 
> It has Intel HD 5500 graphics.
> 
> using xrandr, I can see:
> 
> xrandr
> Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
> eDP1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
>    2560x1440      60.0*+
>    1920x1440      60.0  
>    1856x1392      60.0  
>    1792x1344      60.0  
>    1920x1200      60.0  
>    1920x1080      59.9  
>    1600x1200      60.0  
>    1680x1050      60.0     59.9  
>    1600x1024      60.2  
>    1400x1050      60.0  
>    1280x1024      60.0  
>    1440x900       59.9  
>    1280x960       60.0  
>    1360x768       59.8     60.0  
>    1152x864       60.0  
>    1024x768       60.0  
>    800x600        60.3     56.2  
>    640x480        59.9  
> DP1 disconnected (normal left inverted right x axis y axis)
> DP1-8 connected (normal left inverted right x axis y axis)
>    1920x2160      60.0 +
> DP1-9 connected (normal left inverted right x axis y axis)
>    1920x2160      60.0 +
>    1920x1200      59.9  
>    1920x1080      60.0  
>    1600x1200      60.0  
>    1680x1050      60.0  
>    1280x1024      75.0     60.0  
>    1280x800       59.8  
>    1152x864       75.0  
>    1024x768       75.1     60.0  
>    800x600        75.0     60.3  
>    640x480        75.0     60.0  
>    720x400        70.1  
> DP2 disconnected (normal left inverted right x axis y axis)
> DP2-1 connected (normal left inverted right x axis y axis)
>    1920x1200      60.0 +
>    1920x1080      60.0  
>    1600x1200      60.0  
>    1680x1050      59.9  
>    1280x1024      60.0  
>    1280x960       60.0  
>    1024x768       60.0  
>    800x600        60.3  
>    640x480        60.0  
>    720x400        70.1  
> DP2-2 disconnected (normal left inverted right x axis y axis)
> DP2-3 disconnected (normal left inverted right x axis y axis)
> HDMI1 disconnected (normal left inverted right x axis y axis)
> HDMI2 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
> 
> So, I suppose, I have to use MST to have 3840x2160. However, how to do it using xrandr?
> Is is possible to do it with xrandr 1.4?
> 
> xrandr -v
> xrandr program version       1.4.1
> Server reports RandR version 1.4
> 
> I can set auto do DP1-8 output, which works, however, display shows 1920x2160
> resolution scaled to the whole screen.
> 
> I cannot set auto to DP1-9:
> 
> xrandr --output DP1-9 --auto
> xrandr: Configure crtc 1 failed
> 
> So, is there a way for now to display 4k on the external monitor?

Try
$ xrandr \
	--output eDP1 --primary --preferred \
	--output DP1-8 --preferred --right-of eDP1 \
	--output DP1-9 --preferred --right-of DP1-8
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre