DisplayPort monitor doesn't wake up when turned off and on again

Question

I have a Dell U2515h connected via DP to my Radeon R9 280X with radeon driver.
When I turn the display off with the hardware button and turn it back on, I don't get an output from the default screen - but the framebuffer console works.
The normal set up looks like this:
$ xrandr -q
Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 16384 x 16384
DisplayPort-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 553mm x 311mm
2560x1440 59.95*+
2048x1152 60.00
1920x1200 59.88
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1200x960 59.99
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.08 60.00
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
While I don't have an output, I get the following:
$ xrandr -d :0 -q
Screen 0: minimum 320 x 200, current 320 x 200, maximum 16384 x 16384
DisplayPort-0 connected primary (normal left inverted right x axis y axis)
2560x1440 59.95 +
2048x1152 60.00
1920x1200 59.88
1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1200x960 59.99
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.08 60.00
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
$ xrandr -d :0 --output DisplayPort-0 --mode 2560x1440
xrandr: Configure crtc 0 failed.
Even with the --crtc option and  0..5 as parameters (as shown with xrandr -q --verbose | grep CRTCs) this doesn't work.
So how do I turn the screen back on, preferrably automatically? In Windows this just works™.
Last edited by k0tb4tzen (2015-06-18 21:54:29)

Answer 1

it seems problem in KScreen5
https://bugs.kde.org/show_bug.cgi?id=340267