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

[Lukas Hejtmanek]

Chris,

On Wed, Apr 22, 2015 at 03:27:51PM +0100, Chris Wilson wrote:
> Try
> $ xrandr \
> 	--output eDP1 --primary --preferred \
> 	--output DP1-8 --preferred --right-of eDP1 \
> 	--output DP1-9 --preferred --right-of DP1-8

anubis: ~ $ xrandr \
Continue>         --output eDP1 --primary --preferred \
Continue>         --output DP1-8 --preferred --right-of eDP1 \
Continue>         --output DP1-9 --preferred --right-of DP1-8
xrandr: Configure crtc 1 failed

I can turn on either DP1-8 *or* DP1-9. But not both. No matter which one
I start, the other one fails with crtc 1 failed.

below I provide driver version:
intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20141121
intel(0): SNA compiled from 2.99.916-145-g6c2707d

and this is from log while trying set the output:
[116082.906] (II) intel(0): Enabled output DP2-1
[116082.906] (II) intel(0): Enabled output DP2-2
[116082.906] (II) intel(0): Enabled output DP2-3
[116082.906] (II) intel(0): Enabled output DP1-8
[116082.907] (II) intel(0): Enabled output DP1-9
[116082.995] (II) intel(0): resizing framebuffer to 6400x2160
[116083.043] (II) intel(0): switch to mode 1920x2160 at 60.0 on DP1-8, DP1-9 using pipe 1, position (2560, 0), rotation normal, reflection none
[116083.047] (EE) intel(0): failed to set mode: Invalid argument [22]
[116083.380] (II) intel(0): resizing framebuffer to 2560x1440
[116083.393] (II) intel(0): switch to mode 2560x1440 at 60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[116164.838] (II) intel(0): resizing framebuffer to 4480x2160
[116164.880] (II) intel(0): switch to mode 1920x2160 at 60.0 on DP1-8 using pipe 1, position (2560, 0), rotation normal, reflection none
[116206.941] (II) intel(0): resizing framebuffer to 2560x1440
[116212.223] (II) intel(0): resizing framebuffer to 2560x2160
[116212.243] (II) intel(0): switch to mode 1920x2160 at 60.0 on DP1-9 using pipe 1, position (0, 0), rotation normal, reflection none
[116241.928] (II) intel(0): switch to mode 1920x2160 at 60.0 on DP1-8, DP1-9 using pipe 1, position (0, 0), rotation normal, reflection none
[116242.255] (EE) intel(0): failed to set mode: Invalid argument [22]
[116242.577] (II) intel(0): switch to mode 2560x1440 at 60.0 on eDP1 using pipe 0, position (0, 0), rotation normal, reflection none
[116243.364] (II) intel(0): switch to mode 1920x2160 at 60.0 on DP1-9 using pipe 1, position (0, 0), rotation normal, reflection none
[116275.265] (II) intel(0): resizing framebuffer to 2560x1440

-- 
Lukáš Hejtmánek